What condition involves difficulty sleeping due to persistent worry or anxiety?

The condition characterized by difficulty sleeping due to persistent worry or anxiety is insomnia. Insomnia is defined as the inability to initiate or maintain sleep, and it is often exacerbated by factors such as stress, anxiety, or excessive worrying. Individuals suffering from insomnia may find themselves unable to relax enough to fall asleep or may wake frequently during the night. Anxiety disorders, in particular, are closely linked to insomnia, as heightened levels of worry can lead to racing thoughts that interfere with the ability to fall asleep or stay asleep.

Other choices like bruxism, drowsiness, and somnambulism do not specifically relate to the scenario described. Bruxism refers to the grinding of teeth, often during sleep, but it is not primarily linked to anxiety. Drowsiness is a state of feeling sleepy or lethargic and does not capture the primary issue of difficulty due to worry. Somnambulism, commonly known as sleepwalking, involves walking or performing other complex behaviors while in a sleep state and is not associated with anxiety or persistent worrying while trying to sleep.