Bismihi ta'ala

Clipping of our nails is considered an important hygienic practice in Islam. In our sunnah it speaks about many physical and spiritual benefits of clipping nails. 

Among the etiquette of cutting nails is that one should cut their nails on a Friday, and start from the little (pinky) finger of their left hand, and end with the little finger of their right hand.  

Other days that have been mentioned that would be good to cut nails is Tuesday and Thursday.

It is also mentioned that one should bury their nail clippings, or throw it into nature. 

It is makruh to rip off your nails with biting them off. 

As for cutting nails during the night, there is no evidence for it being bad or makruh. 

In regards to hair hygene, Islam emphasises on this a lot as well. Especially having clean hair, and brushing/combing of hair. As for cutting of hair in the night time or day time, there is also no evidence that mentions it is bad to cut at night.

And Allah knows best.