About LunaSleep

LunaSleep is a free sleep utility built to help people wake up feeling refreshed using sleep cycle science. No sign-up required. Always free.

The idea is simple: sleep happens in roughly 90-minute cycles. Waking up at the end of a cycle — rather than in the middle — means you surface from light sleep feeling alert and restored, instead of groggy and disoriented. LunaSleep does the math so you don't have to.

We've expanded beyond the core calculator to include a nap optimizer, a baby sleep guide by age, and a diagnostic quiz for people who wonder why they're always tired. All tools are based on published sleep research and are designed to be fast, simple, and genuinely useful.

LunaSleep is for informational purposes only and is not a substitute for professional medical advice.