For most women opks do work and help you pinpoint ovulation. Usually only about 10-15% of women don't get clear opk results.
Even with inconsistent sleep I'd still try and do bbt, just do it at the same time, after same activity or whatnot and it should show you a pattern that should be pretty accurate.
Are opks worth it? I can't do bbt (inconsistent wakeup). I'm planning on charting cm, but was wondering if I should also try doing opks. I saw a post where someone said they didn't have much luck with them.
I am one of those women who don't use OPKs anymore, because they don't work for me. I have not seen a positive OPK as yet, yet my bloodtests confirmed Ovulation.
Id say, give it a try, it works differently for all of us. I know women who get positive OPKs a few times a month and therefor cannot pinpoint ovulation. So it can go both ways.
I dont bbt as well as I suffer from insomnia. I just track my CM and do a bloodtest to confirm ovulation.