Circumcision is obligatory in the case of men and Sunnah in the case of women. For more about circumcision in Islam and the wisdom behind it, see the detailed answer.

There is no basis for saying that cutting the nails at night is haram; rather a person may cut his nails whenever he wants, at any time of day or night. Also, there is no basis for saying that one must say Bismillah three times over nails or hair before throwing them away.