Student or Learner
i was slept off when they called me??
i was sleeping when they called me??
he was slept off when i went to his house?
i was tired and slept off when u called me.
how to use sleep and slept ?
 I dozed off (fell asleep) when they called me.
 I was sleeping when they called me (and so I didn't hear the phone OR and the phone woke me up).
 He was sleeping when I went to his house.
 I was tired and had fallen asleep when you called me.