1st one sr guys my eng is not good if i said something wrong abt grammar forgive me abt that . Like i said in the topic , we knew sleeping have 4 stage / wake up/ light / deep/ rem / but wake up at the first of cycle and the last one will make you feel really good and the otherwise wake up at the middle you gonna feel really bad for whole day and the question is how can we wake up at 1st cycle and the last of 4cycle . In google they have some recipe for caculator time to wake up but some people can not fall in sleep in 15 or 30 min someone like me need close to 1 hour for fall in sleep it's hard to caculator . But we have fitbit watch , imagine if FIbit update a alarm wake up for the cycle of stage it's gonna be really awesome to have a full energy and a great day.
