RiseDare Sleep calculator
Tell it when you need to be up, or when you are going to bed, and it finds the times that let you wake between sleep cycles instead of in the middle of one.
Why the time you wake matters as much as how long you sleep
Through the night you move from light sleep to deep sleep and back, again and again. Waking from deep sleep is what leaves you heavy and foggy.
A wake-up time you keep every day, weekends included, does more for your mornings than a heroic early one you manage twice a week.
Knowing your bedtime is the easy part. Getting out of bed when the alarm rings is where most plans fail, and that is the part RiseDare is built for.
Questions people ask
It counts back (or forward) in sleep cycles of about 90 minutes and adds roughly 15 minutes for falling asleep, so that your alarm lands near the end of a cycle rather than in the middle of deep sleep.
For most adults it is not enough night after night. Common guidance for adults is seven to nine hours. Six hours is four full cycles, which is better than waking mid-cycle, but it should be the exception.
No. Ninety minutes is an average. Cycles vary between people and through the night, so treat the times as a starting point and adjust by how you feel.