Why can't I ever fall asleep in my bed anymore?

Whenever I lay in my bed at night I just lay there for like 3 hours awake doing nothing trying to fall asleep. Some nights I doze off slOwly but then minutes later I wake up suddenly and I feel like I'm not breathing and thhink that I'm like dying or something . It never happens when I lay in a different bed or on the couch. I've been laying on the couch lately.