New hamster - hiding a lot

[Smokey the hamster]

My Russian Dwarf Hamster does the exact same thing but seems to sleep all the time and get in the early hours of the morning.
I know this because I stayed up to one in the morning and he still didn't come out but when I woke up a biscuit had moved that I put into his cage so he must of gotten up quite early then gone to sleep quite early aswell.