How long does it take for full recovery?

Each time I've quit for an extended period of time it's taken me about three weeks to feel normal. During those weeks I definitely feel more grumpy and irritable. I'm also curious as to whether THC or other chemicals in the smoke have any effect on the body's thermoregulation, because each time I've quit I've also woken up drenched in sweat every night for about the first week or so. Crazy dreams as well.

These have all been me going cold turkey after heavy daily use for extended periods of time.

I find sleep changes really noticeable, so so everyone else. Dreams become very vivid for couple of days to a point of discomfort.

When you smoke i never dream. When you stop body overcompensates.

I wonder if it's suppressing REM sleep like alcohol does

It does. My understanding is that THC inhibits REM sleep, and as a result the chemicals that are usually released during the REM phase that cause you to dream do not get released. Once you quit and start having REM sleep again, there's a "backlog" so to speak of the chemicals and more than usual are released, thus causing the extremely vivid dreams.

As he said, a couple weeks.