my son is waking up 4x a night

My son is 4 months old and has never been a good sleeper. The longest he's slept is 6 hours and that's only been a handful of times. Normally he wakes up 2 times to dream fed then goes right back to sleep. The pst 2 weeks he has been waking up atleast 4 times a night, eats a little then goes back to sleep. Then at about 6 he won't stop moving and acts like he can't get comfortable. Is this just the 4 month sleep regression? And if so how long does it last?