Waking up

[Goliath]

No... not really. I think they have an internal clock or something. They just know, i guess. I know this because it's always dark in my room.

[StarlightSerenity]

Hamsters arent nocternal - they are Crepuscular which is the term used for animals awake during dawn and dusk

[Humphrey Furball]

As others have said, rustling the bedding, or moving some toys a little bit seems to tempt them out to see what's going on. Reinforce this with a tiny treat a few days in a row, at a regular time and he should wake up more easily. I learned the hard way waiting for my first hammie to get up himself; he would often wait until late at night, but with something to get up for, he soon came around