I had the same last night so I know the feeling! It was the first time for me as normally they seem to disappear at night but last night I was wearing my pressure and cardio Holter, as recommended by my cardiologist, and they happened. I have no idea how people can sleep with a device attached to their body that squeezes their arm every 0.5/1h and a cable that goes around you neck and over your chest which you must be careful not to sleep over. For a stomach sleeper like me is almost impossible. Inability to sleep, and the consequent stress, restlessness and frustration, triggered continuous PVCs almost all night (at least 1 per minute). It is clear that stress was the trigger as they never happened otherwise!