My tank is in the spare bedroom, so they don't see any lights getting turned on in the morning. Just the sun rising and slowly lighting the room. I get up at 5:30 for work, so I doubt they'd like that.
However, if it's late at night and I turn the lights on, most of them are down against the gravel and usually hiding behind plants or something. My pleco, who is only active at night, will go nuts and rush back to his hiding place.