Sleep clinic would be the most precise but personally I think it induces its own bias as we sleep best in our own beds. Hopefully we sleep in our own beds most of the time.
So what consumer choices are there?
Apple Watch is what I read in this thread but any other fitness trackers/phones with reasonable accuracy ?
I am very doubtful of just a phone app accuracy without some on body sensors.
Sometimes you might wake from 7.5 hours of sleep groggy and with a headache and sometimes you might feel fresh after 6 hours.
If good sleep is one of the most important things in prolonging and improving your quality of life then it would make sense to take advantage of modern technology to track it.
What's the point of investing extra $100 for retirement if you do not live to enjoy it?
Besides, I live in a country where retirement is far from certain.
I would at least like to know the optimal time for waking up.
Also waking up without an alarm clock can sometimes lead to oversleeping which is not optimal either.
Ever wake up groggy and with a headache on a Sunday morning after 10 hours of sleep?
Pretty comprehensive recent review https://www.wareable.com/health-and-wellbeing/oura-ring-2018...
All fitness bands brands (Huawei, xiaomi, Fitbit) today track your sleep. You can give it a try and decide by yourself.
Still not certain whether it works or not. Sometimes it tells me I’ve slept with a 90% quality but I still wake up feeling a little bit tired..