sleepytime (by somnia) is a minimalist bedtime calculator designed to eliminate morning grogginess by aligning your alarms with natural 90-minute sleep cycles. Instead of just counting hours, the tool works backward or forward in 90-minute increments from your target time, building in an adjustable 15-minute buffer for the time it takes to fall asleep.

Hi everyone! I stumbled across Sleepy Time and had to hunt it because it solves a problem we all deal with—that brutal, groggy feeling when your alarm goes off mid-cycle. I love how simple, clean, and straightforward the interface is. No bloated features, just quick math to help you wake up feeling actually rested. I’ve hunted this so the community can check it out, and I'd love to invite the Maker to jump into the comments, share their story, and answer any questions! What do you all think? How do you calculate your sleep cycles?

I've been reading a lot about sleep inertia lately that brutal, heavy grogginess that hits when your alarm goes off while you're still in deep sleep. The popular theory says our sleep runs in roughly 90-minute cycles, and that waking at the end of one can leave us feeling more refreshed. But human biology isn't always that neat. Stress, age, caffeine, late-night screen time, and countless other variables can easily shift those patterns.

I'm curious how the makers and builders here approach sleep. Do you actually optimize around sleep cycles, or do you focus more on getting a consistent 7 8 hours and calling it good? Have you found any routines, habits, or simple tracking methods that genuinely reduce morning grogginess? I'd love to hear what has worked for you and whether the sleep-cycle idea holds up in real life.

Sleepy Bedtime Calculator

Stop Guessing, Start Resting

Stop Guessing, Start Resting

Forum Threads

The 90-Minute Rule: Do sleep cycles actually work for you, or is human biology too messy

Forum Threads

The 90-Minute Rule: Do sleep cycles actually work for you, or is human biology too messy