Kids habits and behavior

Toddler may have some weird behavior that adult might seem hard to understand. Strange habits by kids may or maynot have reasons behind but it may goes away after sometimes-hopefully. My daughter has one weird behavior too. She can't seem to live without me when the lights goes off at night. Even if her father or her grandma is around, she will just crying non-stop until she see or hear me around; or if the light is switch on. However, she has no problem sleep at her spring cord swing with the light on, and without me. This strange behavior has cause me a problem as I can't simply leave her at night. Maybe this is her tactic to keeps mommy around during night time, hehe....