I've had a Venu 3 now for almost 2 weeks. It doesn't track sleep very well when compared to my Venu 2. On my Venu 2, I can edit sleep start time and it will include accurate sleep data over the new time span. The Venu 3 does not display accurate data, it simply displays "light sleep" over the entire added span. I take cancer meds which have insomnia as a side effect so i get irregular sleep (waking up 4-5 times and sometimes for half an hour). But I need to know what sleep i do get in these fragmented segments. I'll have to wear my Venu 2 at night for sleep stats and then my Venu 3 in the day for the time being until this gets a solution. Kind of ridiculous, huh?