By Yelena Mandenberg A sleep doctor has warned that what you do in the morning could be causing your insomnia at night. Staying in bed for anything other than sleep and intimacy can leave you feeling groggy and tired, disrupting your circadian rhythm. Dr. Chester Wu, a psychiatrist and sleep medicine specialist, said: “I try not to linger in bed because I definitely feel like that causes me to feel more lazy or groggy.” He added that health behaviours in the morning reinforce a strong circadian rhythm, promoting wakefulness during the day and sleepiness at night. Many other sleep doctors agree…