Calories Burned While Sleeping – BMR‑Based Estimator
Based on your weight and hours slept, estimate how many calories you burn simply by sleeping. See the contribution of basal metabolic rate to daily energy use.
UD5 Toolkit
Based on your weight and hours slept, estimate how many calories you burn simply by sleeping. See the contribution of basal metabolic rate to daily energy use.
Play continuous white, pink, or brown noise directly in your browser. Includes a timer for sleep and volume control for office concentration.
Log the hours you slept each night and rate the quality. See a weekly bar chart. Local storage.
Generate a sample sleep schedule for babies 0-24 months based on age-appropriate wake windows. Nap count and bedtime suggestions. Educational reference.
Visualize how caffeine decays in your body over time. Enter intake amount and see remaining caffeine at bedtime to optimize sleep. Uses standard 5-hour half-life.
Generate continuous white, pink, or brown noise for sleep or concentration. Adjustable volume with offline support via Web Audio API. No downloads needed.
Request and release a screen wake lock to keep the device awake. See the lock state in real time. Perfect for recipes or presentations.
Set a nap timer with optional gentle white noise or lullabies (Web Audio). Reminder to put baby down. Fully local, no ads.
Log daily sleep to see cumulative sleep debt or surplus over weeks. Visualizes chronic sleep loss trends. Stores data locally in your browser only.
Find the optimal go‑to‑sleep or wake‑up times based on 90‑min sleep cycles. Wake up between REM cycles and feel refreshed.