I have 24 baby chicks. I have 14 in a big blue tote basket, and I have 10 in a very deep old dresser drawer. I am keeping them in my house because is it so cold and windy outside. My question is, would it be ok to turn off the heat lamp at night before I go to bed and just put a thin blanket over the basket and drawer I have them in, or do they need to be uncovered and the light kept on?