How to ensure ISM is continuously monitor my sleep at night?

I do the following to confirm the ISM is connected and working:

1. Hold thumb on sensor for two or three seconds and remove
2. Watch sensor light up
3. Put ISM on my arm
4. Feel the vibration telling me the ISM is on
5. Look at GC on my phone and watch the ISM sync once.
6. Turn of phone (I do not like it on at night)

Morning

1. Take off ISM and turn inside out
2. Turn on phone
3. Let sync
4. Watch GC and watch sleep data populate
5. Turn on BT watch
6. Sync watch
7. Done!

1.  DoctorCool Thanks for your guidance. I always press and hold the optical sensor for few seconds to initiate the red /green LED before wear it.  I am not sure if my sleeping time (11.30pm to 5.30am) affects the ISM connectivity, last night I slept earlier at 11pm, half an hour earlier than my preset sleeping time?

slugwalker You are welcome.  I do not think sleeping time impacts whether or not the ISM monitors your sleep.  I think the main thing is making sure the ISM is a) turned on and active when you put it on and b) has sync'd at least once with GC before going to bed.  But that is just my $0.02.  I have had success though with the ISM following the above without any connectivity drops.  Hope that helps.

Well, I will follow your way to make sure sync both ISM and GC again before sleep. Thanks