There is nothing more annoying than a screaming cat at 3am. No matter how much we love our precious felines, this habit can make pretty much anyone curse or cry, or both. As adults, there may be many reasons that keeps us awake at nights, but the screaming cat is the least you probably want to have on your list.
Putting aside the possibility of mental or physical illnesses and the heat, your cat might be just a great talker, attention seeker, or very bored. Take it as a compliment and do not respond if you feel bothered. The less you respond to meowing the less likely your cat will use it to get attention.
If you keep your cat out of your bedroom at nights, then he just might want to “claim his territory” back. To kindly stop your kitty from brutally insisting on getting into your room just buy a sensor that blows air and put it behind your door. This habit will be gone soon, trust me. But at any circumstances DO NOT give in and attend your cat during his meowing session. They learn really quickly what works and what doesn’t.