An objective measure of sleep/wake behavior based on body movement.

Proven Motionlogger® technology used in sleep clinics around the world.

100M water resistance means you never have to take Zzz-Logger off.

30+ day, easy-change battery

Press the button for a quick look at your last sleep/nap results on the display

Press and hold the SLEEP button to see SleepTank stats.

Zzz-Logger synchs wirelessly to your smartphone for a full report.

Zzz-Logger automatically estimates your bedtime and final awakening.

Any nap of 20 minutes or longer is captured.

Study Mode provides no Sleep, or Sleep Tank output on watch

Also counts your steps!