Hi there,
I would say it is quite normal regarding the fan speed.
When the laptop is in sleep mode, most of the functions are still working, so there will be heat generated.
The device would be even hotter if you close the lid.
So after waking up from sleep mode, the system temperature would be detected and the fan would spin up.
The RPM seems fine too. 4700 RPM is not that high.
Thank you.