Singing after the F-RTR?

[Lightning_Puma]

Hi, so this might come off as a stupid question, but regardless, I wanted to ask.

Whenever I am done with the F-RTR and do the cleaning, I just start to sing until I become conscious that I'm singing, well humming more like it, but still.

Is this normal?

 

[AFODO]

This might be an effect of hapiness or freeness, and this is normal.

 

[Lightning_Puma]

This might be an effect of hapiness or freeness, and this is normal.

Makes sense. Thanks!