Pulmonary edema (wet lung) Pulmonary edema is caused by excess fluid in the lungs, and is usually caused by a heart condition. The accumulation of fluid can make it difficult to breathe, which can cause you to wake up gasping for air.
Why do I forget to breathe when falling asleep?
Central sleep apnea is a sleep disorder in which you briefly stop breathing during sleep. Moments of apnea can occur repeatedly throughout the night as you sleep. The interruption of your breathing may indicate a problem with your brain's signaling. Your brain momentarily “forgets” to tell your muscles to breathe.
Why do I wake up choking and can't breathe?
Obstructive sleep apnea can cause your breathing to start and stop while you sleep. It can lead to the throat muscles relaxing so much that they block your airway. You may wake up abruptly gasping for air or choking.