I'm afraid I had 3 sweeps with no result in my 2nd pregnancy Maybe that's a record!
In my first pregnancy though I did go into labour after a sweep - had sweep late afternoon on day 8 and went into labour at 6 am day 9 (dd wasn't actually born until day 10). So your sweep may still work as it seems quite common for it to take some sleep to bring it on - maybe as it seems more common to go into labour during the night or early hours of the morning.
Each of the sweeps I had 2nd time round did produce some braxton hicks and general discomfort so that I kept thinking something was happening and I did dilate a bit, so that after the third sweep they could easily break my waters to induce me, rather than having to have prostaglandin gel. (I did also try sex, orgasm, curry, pineapple, raspberry leaf tea and reflexology - I could feel the reflexology stimulating my uterus and also making baby jump around, so definitely did something, but didn't start labour unfortunately).
Sorry - that's rather negative, as I did have to be induced by having my waters broken in hospital even after 3 sweeps(couldn't do that at local birthing centre). On the other hand my first labour was 26 hours plus and quite traumatic with dd stuck for hours and hours when I was 8 cm and in a lot of pain, second time round after all my attempts to bring on labour, when I finally did go into labour it only took 3 hours 20 minutes, so perhaps all the things I did really prepared my body well for labour.