Destroy 4 blocks in your roof.put four redstone laps in the hole.put a daylight sensor one block away from the redstone laps.put a block 2 blocks away from the daylight sensor then put a redstone torch on the blocks side facing the redstone lap.then put redstone in the middle of the daylight sensor and the block with the redstone torch.then put redstone on the redstone laps.thay might be dark right now but wait till it is night then thay will turn on.look no leavers!!!!