Common Questions
Sleep Science FAQ
What is a 90-minute sleep cycle?
Sleep occurs in repeating cycles of roughly 90 minutes, each containing light sleep (N1/N2), deep sleep (N3), and REM sleep. Waking at the end of a complete cycle — rather than mid-cycle — leaves you feeling alert and refreshed instead of groggy.
How many sleep cycles do I need?
Most adults feel best with 5 complete cycles (7.5 hours). Four cycles (6 hours) is a minimum for most people, and six cycles (9 hours) is ideal during recovery, illness, or intense training periods.
Why does Soluna add a 14-minute buffer?
Research shows the average adult takes about 10–20 minutes to fall asleep after lights out. Our calculators use a 14-minute average so your wake time recommendations account for this natural sleep-onset latency.
What is circadian rhythm and why does it matter?
Your circadian rhythm is a roughly 24-hour internal clock governed by light, temperature, and social cues. It regulates when you feel sleepy or alert, and misaligning sleep with your rhythm leads to poor sleep quality even if the duration is adequate.
Is this medical advice?
No. Soluna Sleep provides general wellness information based on published sleep science. If you have a sleep disorder, persistent insomnia, or other health concerns, please consult a qualified healthcare provider.