Last updated 10 November 2026
These terms are the agreement between you and Siyan Clinical Corporation for the use of the Siyan Somnus app. Please read them. By creating an account or using the app you accept them. If you do not accept them, do not use Somnus.
This document is also the end user licence agreement for Somnus on the Apple App Store and on Google Play. It replaces Apple's standard licence agreement for this app.
You must be 18 or older. Somnus has not been designed or evaluated for use by anyone under 18. The app asks for your date of birth during setup and will not let you continue if you are under 18.
You need your own account. Do not share it, and do not let anyone else use it — the coaching, the sleep window and the analysis are all calculated from one person's nights, and they mean nothing if two people's sleep is mixed together.
You may use Somnus only where it is lawful to do so, and only if you are not located in a country subject to a United States embargo and are not on any United States list of prohibited or restricted parties.
Somnus is a consumer sleep-wellness app. It gives you:
This section matters more than any other in this document.
If you are in crisis, use a crisis line, not this app. findahelpline.com lists free, confidential services worldwide. In the United States you can call or text 988, text HOME to 741741, or call 911 if someone is in immediate danger.
The guided plan includes a sleep window: a bedtime and a rise time calculated from the nights you have logged. Narrowing time in bed is the central mechanism of this kind of plan. It is only a suggestion, and you are free to follow it, adjust it or ignore it. It is not a prescription, it is not issued by a clinician, and no clinician has reviewed your case.
Deliberately spending less time in bed can make you sleepier during the day, which carries real risks:
Somnus will not shorten your sleep window at all if you have told it that you have sleep apnoea, narcolepsy, bipolar disorder or seizures, or that you work shifts. In those cases the window is kept at a full night and the app tells you why. This is not a diagnosis and not advice — it is the app declining to apply one specific technique, because that decision needs someone who knows your health history. Tell the app about these conditions honestly, and talk to a professional before narrowing your time in bed.
You can type to the coach or speak with it. Its written replies are generated by a large language model running inside our own AWS account — at present, Anthropic Claude models on Amazon Bedrock. When you speak with it, the audio from your microphone is streamed to ElevenLabs, a third-party speech company, which turns your voice into words and speaks the reply back to you. Your voice therefore leaves your device and our systems and reaches another company. If you would rather that did not happen, type to the coach instead — it is the same coach, with the same history.
You must understand the following about the coach:
Do not put anything into the coach that you would not want stored. Your messages and the coach's replies are saved to your conversation history, and spoken sessions are saved as transcripts in the same place.
If you allow it, Somnus reads sleep and related measurements from Apple Health on iPhone or Health Connect on Android. It reads only — Somnus never writes anything into Apple Health or Health Connect. You can withdraw that permission at any time in your phone's own settings, and you can always keep a diary by hand instead. Features that depend on measured vitals or sleep stages need a device that records them; without one, those parts of the app stay empty.
What we do with that data is described in our privacy policy.
Somnus is sold as an auto-renewing subscription, bought inside the app through the App Store or Google Play. There are four plan lengths. The price, the currency and the length of any free trial are set by the store and shown to you in the app before you confirm — what the store displays at the moment of purchase is what governs.
Somnus offers a free trial of the whole app. The app runs a 14-day trial clock from the moment you finish setting up, so you can use everything before deciding. On the store side the free period is an introductory offer on the plan you choose, and its length is whatever the store shows on the paywall before you confirm. If the two ever differ, the store's figure is what you actually get.
You keep the sleep diary — logging nights, the score each night produces, and the last seven nights as a trend — along with a few stories and soundscapes marked free in the library. These need a subscription: the AI coach in writing and in voice, the eight-week plan and the sleep window it sets, the rest of the audio library, and the longer-term patterns and analysis. Access to the paid features stops as soon as a trial or a paid period ends; there is no grace period.
Cancel through the store, not through us. We cannot cancel a store subscription on your behalf.
Cancelling stops future renewals. You keep access until the end of the period you have already paid for.
Deleting your Somnus account does not cancel your subscription. They are separate things held in separate places: your account lives with us, your subscription lives with Apple or Google. If you delete your account without cancelling, the store will keep charging you. Cancel first, then delete. See deleting your account.
Purchases made through the App Store or Google Play are refunded by Apple or Google under their own policies. We cannot issue a refund for a store purchase. If you believe something has gone wrong, write to us anyway at support@siyanclinical.com and we will help where we can.
Use Somnus for your own personal, non-commercial sleep. Do not:
We may suspend or close an account that breaks these rules, or that puts other members or the service at risk.
Yours stays yours. Your sleep logs, check-in answers, thought records, medications, notes and coach conversations belong to you. You grant us only the licence we need to run the service for you: to store that content, to compute your metrics, plan and sleep window from it, to give the coach the context to answer about your own data, and — only if you switch it on — to share it with a coach you have linked. You can export everything or delete it at any time.
Ours stays ours. The app, its design, its code, the eight-week curriculum, the recordings, the written lessons, the Siyan and Siyan Somnus names and logos, and everything else we provide are owned by Siyan Clinical Corporation or our licensors and are protected by copyright and other laws. We grant you a personal, revocable, non-exclusive, non-transferable, non-sublicensable licence to install and use one copy of the app on devices you own or control, for your own non-commercial use, for as long as these terms are in force. No other rights are granted.
Somnus will change. We add, alter and remove features, and we may change what is included in a paid plan. We aim to keep the app available but we do not promise uninterrupted service, and parts of it depend on services we do not control, including Apple, Google, Amazon Web Services and ElevenLabs. Where a change materially reduces what you have paid for, we will give notice if we reasonably can.
To the fullest extent the law allows, Somnus is provided as is and as available, without warranties of any kind, whether express, implied or statutory, including any implied warranties of merchantability, fitness for a particular purpose, accuracy, or non-infringement.
In particular, we do not promise that:
Some jurisdictions do not allow the exclusion of certain warranties, so parts of this section may not apply to you.
To the fullest extent the law allows, Siyan Clinical Corporation and its officers, employees and suppliers will not be liable for any indirect, incidental, special, consequential, exemplary or punitive damages, or for lost profits, lost data, or loss of goodwill, arising out of or relating to your use of Somnus — even if we have been advised that such damages are possible.
To the fullest extent the law allows, our total liability to you for all claims relating to Somnus is limited to the greater of (a) the amount you paid us, or paid Apple or Google for Somnus, in the 12 months before the event giving rise to the claim, or (b) twenty-five United States dollars.
Nothing in these terms excludes or limits any liability that cannot be excluded or limited by law, including liability for death or personal injury caused by negligence, or for fraud. Some jurisdictions do not allow some of these limitations, so parts of this section may not apply to you.
You agree to indemnify and hold Siyan Clinical Corporation harmless against claims, losses and reasonable costs arising from your breach of these terms, from content you put into the app that you had no right to give us, or from your use of Somnus in a way these terms do not permit.
You can stop at any time: delete your account in the app, and cancel your subscription through the store. We may suspend or end your access if you break these terms, if we are required to by law, or if we discontinue Somnus. When the agreement ends, sections 9 (as to our ownership), 11, 12, 13 and 15 survive.
These terms, and any dispute arising out of them or out of your use of Somnus, are governed by the laws of the State of California, USA, without regard to its conflict-of-laws rules. You and we agree to the exclusive jurisdiction of the state and federal courts located in California for any dispute, except that either of us may seek injunctive relief in any competent court. If you are a consumer resident elsewhere, nothing here deprives you of the protection of the mandatory consumer laws of the country you live in.
Before filing anything, please write to support@siyanclinical.com. Most things are faster to fix than to litigate.
This section applies when you obtain Somnus from the Apple App Store, and it prevails over anything inconsistent elsewhere in these terms.
When you obtain Somnus from Google Play, this agreement is between you and us. Google is not a party to it and is not responsible for Somnus. Your use of Google Play is also governed by the Google Play Terms of Service, and billing, cancellation and refunds for purchases made there are handled by Google under their policies.
We may update these terms. The date at the top changes when we do. If a change materially affects your rights we will give notice in the app or by email where we reasonably can. Continuing to use Somnus after a change means you accept the updated terms. If you do not, stop using the app, cancel your subscription and delete your account.
These terms, together with the privacy policy, are the whole agreement between us about Somnus. If any part is held unenforceable, the rest stands. Our not enforcing something is not a waiver of it. You may not transfer your rights under these terms; we may transfer ours as part of a merger, acquisition or sale of assets, on notice to you.
Siyan Clinical Corporation
California, USA
support@siyanclinical.com