If you can find the time, have a shower every morning. You don’t need to wash your hair every day, but a shower will help wake you up and provides a great opportunity to thoroughly wash your face.
If you don’t moisturise enough, your skin will be dehydrated and look dull. It also provides a great base for your foundation.
You don’t need to use lots of foundation. A light tinted moisturiser or one with light coverage is all you need to perk up your skin.
Blusher is perfect to give your skin some much needed colour, especially if you haven’t had much sleep. Simply sweep it across your cheeks and you’re done.