Get him a fitbit..! You and your siblings can put together money and get him one, here's a link!
Fitbit prices can range from 30.00-100.00$+! I recomend the FitBit FLEX. It's like a bracelet, you can set it to vibrate at a certain time (I have one). It automatically tracks sleep, or you can simply tap 3 times to sleep (log/auto log). You can have friends and allow them to view things such as how long you slept, what you ate. If he has a phone, he should download the fitbit app (ios) HERE and Turn on BLUETOOTH and connect them!
I hope this helped!