Stress: Concerns about work, school, health, finances or family can keep your mind active at night, making it difficult to sleep.
Travel: Your circadian rhythms act as an internal clock for all parts of you. Disrupting these rhythms can lead to insomnia. Common disruptions include jet lag from traveling across multiple time zones, working a late or early shift or frequently changing shifts.
Poor sleep habits: These can range from stimulating activities before bed, a new environment and blue light from screens (phones, tv, tablet, etc) before bed.
Eating too much late in the evening: Eating too much may cause you to feel physically uncomfortable while lying down as well as experience heartburn or indigestion which can keep you awake.