In this app, you get the opportunity to keep a diary of your sleep. Every day you must log in and record how you slept the previous night. Filling in a sleep diary regularly over a period of one to two weeks is an effective and simple method of charting your sleep. For sleep specialists, such a diary usually provides more useful information than, for example, smart watches. The information is particularly useful in the investigation and treatment of sleep problems, particularly in the case of insomnia and circadian rhythm disorders, where such diaries play an important role both for diagnosis and for monitoring how you respond to treatment. It can be challenging to know exactly how long it takes you to fall asleep and how long you are awake at night. Even if the app asks about these things, it's important that you don't get caught up in watching the clock at night. When you have to keep a diary for the previous night the next day, your best estimate of how you slept will be good enough. Through the app, we hope to offer you a tool that can help you gain a better understanding of your sleep.