There are 2 schools of thought. Some swear by the use of a night moisturiser before retiring to bed, while others follow a more holistic approach and don’t put anything on after cleansing and toning at night.
It really depends on the individual and how your skin responds to the different night time treatment methods. But the best way to find out what works best for you is to trial both methods. Allow a month to yourself without the use of any moisturisers before going to bed and another month with moisturisers at night, then weigh out the results to see how your skin reacts after 28 days.