People should not use that stuff while sleping, but they do so to avoid the tattoo stickin to their clothes and over drying. There is something much better and actually created fo similar purposes, it is bio occlusive dressing. It is a transparent self adhesive film that you apply after gettin your tattoo done and leave on for 4 days. You do nothing else and use a regular routine, showers, sleeping, etc... After 4 day you peel it off, wash moisturize and that is it, your skin will be back to normal days quicker then the regular wash/ointment method.
I use Opsite Flexifix as a brand, and it is the best thing ever to heal tattoos, I have healed over 85 hours of tattoos on myself with nothing but excellent results. It is the cleanest method possible to heal tattoos, it is breathable, color retention is also improved.

   i've used the plastic wrap stuff before just long enough to get home and then take it off and clean my tattoo and apply lotion then i sleep on a over size towel it's mostly to keep your clothes clean

Originally posted by Keiran1980 I wrap my tattoos for around 3 days. I have to change the wrap every 2 or 3 hours to stop bacteria reaching high levels. This normally includes me getting out of bed to change the wrap in the night.Â

You should really try Opsite Flexifix...no need to change it at all.

Originally posted by Jack Crrack I follow the aftercare instructions of the artist who's done the work on me. Trust their work, trust their aftercare.

With the so many different kind of reactions people have to different methods, that is not necessarily good advise.
When someone finds something that works well for them, they should do it not matter what the artist recommends...and all artists I know agree with the "what works best for you" premise.

Originally posted by Jack Crrack If that's the case, you advice is also not necessarily good.

Exactly, glad to see you understood why your advise is not necessarily good.