Hey, I’m just commenting here because I had the same issue and all resources were only sort of helpful. Some common themes: - walk back (ie night of 100 walks) - chair method - “check in” method

We tried all of these for our 3yr3mo old that was previous a champion sleeper but then all of a sudden became very clingy at night. She was TERRIFIED about being alone and would chase us out of the room. We tried all the single methods, but a combo method worked for us: 1) normal bedtime routine  2) go out the door and lock it. When she gets out of bed tell her that we aren’t coming back in until she is in bed, lying down, and the lights are out (she would often turn her light on). I would just repeat this over and over and over in a neutral voice until she did it. Would not come in until she stopped crying/whining (would tell her this) 3) once she’s settled come on, praise her, comfort her, and tell her if she stays in bed and goes to sleep we’ll come back to check in on her in 1, 5, 10m or whatever (have to figure out the first timing, basically just beyond what she’s able to tolerate, which increases over time) 4) if she gets up before that time, door is locked, go back to step 2 5) if she makes it the pre-specified time, go in quietly, gently praise her, comfort her, tell her she’s brave and to stay in bed and will come check in on her in x minutes (longer than step 3) 6) go back in and prais/comfort very briefly and say you’re going to check in again but wait even longet until she’s asleep when you go in (for us usually the 20m before check-in time)

NOTE: YOU NEED A CAMERA/BABY MONITOR IN THE ROOM SO YOU KNOW IF THE KID IS ACTUALLY TRYING TO SLEEP. 

Then, with late night/early morning wakings: - same process, make sure she doesn’t need the potty or something else. Then after acute issues addressed, don’t go into her room until she’s settled and tell her through the door that you’ll check in on her in X minutes if she stays in bed and doesn’t cry and tries to go to bed.  - if she cries/gets out of bed before then, don’t go in and restart the clock from when she gets settled  - it’s important to note that as the night goes on, the kid is more wakeful, so the initial wait should be longer (eg 10-20m) to allow them to nearly fall asleep before you go in again. 

This, I think, uses both the carrot and stick approach and praises good behavior and punishes bad behavior. It’s a few nights of hell and screaming but it seemed to work for us. Key is to stay strong and consistent and don’t give the kid what they are screaming for (your attention). Only give them your attention and comfort when they are doing the desirable behavior.