Are toddlers scared of the dark? My 18 month old sleeps alone in his room. Should I be leaving the light on?

Toddlers don't generally experience this kind of night time anxiety until they are about 2-3 years old. Your toddler probably won't even understand the concept of fear yet, or be able to imagine scary things lurking in the dark. In this case, he will sleep better in a dark room. I feel that it will be better not to introduce using a night light as it will be hard to kick off the habit. My son doesn't use a night light and he have been sleeping fine in the dark since he is born. If your toddler is really afraid of the dark, use one that provides enough light for comfort but doesn't illuminate the room too much.