Blonde asking questions again

[Burium]

Okay, I know cresteds are nocturnal. Do they have an internal time clock telling them, "Hey! It's dark out. Time to wake-up!" or is it based on observible light? ie. If you have them in a completely darkend room and it's 11:30 am would they be out and active? And vice versa. If you had them in your living room and the lights are still on at 11:30pm would they still be sleeping? Just checking. Still deciding where to put them. Thanks.

Kelly