Need help on sentence fragments. ~~thanks.

One time, I felt deeply understood when my sister turned off the light for me because I fell asleep. I'm not the type of person who falls asleep easily. sometimes, when i went to bed before my sister did, I wanted the lights to be turned off but she wouldn't. I couldn't sleep. Last night, she turned off the light for me when I went to bed. And I was appreciated.

Leave "One time, I felt deeply understood was when....." as it is,
my teacher said that this "....my sister turned off the light for me because i fell asleep." is a fragment,
but i don't know how to correct it.
there's one more sentence fragment in this writing, i believe it's "sometimes, when i went to the bed before......."
can anyone help me correct it? and other grammar errors if possible............thanks!!