Vitamin K is a fat-soluble vitamin, which apart from being found in green vegetables, is also produced by bacteria in the intestines. Antibiotic are medicines which help fight bacterial infections by killing harmful bacteria in the body. Sometimes, taking antibiotics can kill the bacteria producing Vitamin K in the body and can then result in reduced synthesis of vitamin K.
If you are going off of the three meals a day I would say dinner, you can sustain proper energy all day then at night you can rest and regain energy that way.
