Oregon Scientific Smart Dynamo 2 Help Content & Faq page 51

up time is set (See Wake up time setting section of this manual) before you sleep.
Start Sleep Monitoring Mode
Press and hold the operation button on Dynamo 2/Dynamo 2+ until the smart core displays
and then vibrates.
Set your operation button to Sleep monitoring before using this function.
- OR -
Tap Enter sleep mode in Ssmart Fit App on your mobile device, your Dynamo 2/Dynamo 2+ vibrates once
entered.
To check if the Dynamo 2/Dynamo 2+ is working properly, press the operation button. The smart core displays
and the Fell asleep time counter starts when the Sleep Monitor Mode is on.
The Dynamo 2/Dynamo 2+ automatically exits from sleep monitoring mode after 12 hours from the moment
sleep mode was entered.