I had essentially no quality sleep the week following surgery, and blame it primarily on the dexamethasone steroid I was on to manage swelling. It took me forever to fall asleep (even though I was exhausted), and then I'd only sleep in fits. Then I'd end up napping a few times over the following day... My DR prescribed me sleeping pills to take at night, which I (foolishly?) did not use, thinking I'd rather tough it out than subject my poor abused body to more chemicals...
Anyway, when I finished the ~week-long steroid course, within a few days - I was sleeping much better. Now (2 months post surgery), I have no problems at all sleeping.
The first ~two weeks post surgery are rough on a number of fronts!
Assuming your DR agrees... eat healthy, drink lots of liquids, do your vestibular exercises as prescribed, walk regularly, and nap at all other times
And hang in there, you should (will!) feel better each day and before you know it this should all be a distant memory!