I have a question with my son who is 20 months now. He was sleep trained as a baby and everything was going well. Since a month ago he just doesn't sleep!

He was sick for few days and I provided an extra care, cuddle, I had carried him and comforting.

Since that time, I feel he forgot how to sleep on his own. Wants to be carried at bedtime and through the night. Waking up very frequently, crying and looking for me. As soon as put him back to laydown 1min after he is up again and again.

Afternoon nap is perfect, no problems in settling and last for 2 hours or 2.5

Any suggestions please??