Welcome to the forum @Nuala - what a shame your holiday was cancelled - but ... health always comes first.
Sadly, sleep deprivation is the one thing that most of us endure as a result of BC ..... either from the stress of worrying about it, or from the side effects of surgery & medication. I try to keep external noise to a minimum, so wear ear plugs and sometimes (on full moon) I even wear an eye mask (as from airlines) to keep that extra light out of the room. Being too hot or too cold can also affect your sleep (I currently have a small portable aircon/dehumidifier that I use on the hotter nights, which helps - and the ear plugs cut the noise out!)
All the best with your ongoing treatment xx Whack up any questions that you may have & we'll do our best to answer them xx