Even with all the stuff I placed over and around the windows, the small amount of daylight that leaks in at the break of dawn (currently 4 AM) is enough to wake me up.
Because I can't do any more to block it and still let in some air, I'm trying something new: Instead of using the red Nightlight preset on Philips Hue, I have made a Moonlight preset, which is just the Energize preset (cold white) on minimum brightness. It seems to mask daylight better.