Your pulse rate was generally within a normal range (60 to 100). I don't know why it was higher for a while and then lower. Your O2 levels were also within a normal range (89 to 100). Again, I don't know why there was more variability for a while and then less. It looks like the battery ran out at around 4:40.
In other words, I don't see anything here to worry about even a little bit. You can get some more nights of data and see what kinds of readings are normal for you. The occasional higher pulse rate may just indicate something going on in your REM sleep; the occasional drop in O2 levels may just be a momentary loss of contact with the sensor. In other words, ignore brief and infrequent readings outside the normal ranges.
I'm curious why you decided to track these data. Was there something worrying you?