Why do babies get fussy about going to sleep even when they are tired?

Change: A babies perception may be stressed as they enter into a sleep phase as they don't understand leaving an awake state. They are aware something is happening but don't wish it too. Try playing soothing white noise - spa music - in the background to help the baby relax. Avoid rocking to sleep as they will get used to it and will grow older and have sleep issues unless always rocked.