Somnambulism (noun)

1. The act of sleepwalking; a condition in which a person gets up and walks around during sleep.
2. The condition of being in a sleep-like state while performing activities that are normally associated with wakefulness.

Origin:

The word "somnambulism" comes from the latin word "somnus" which means "sleep" and "ambulare" which means "to walk", thus referring to the phenomenon of sleepwalking.

Examples:

1. He had a history of somnambulism, often getting up and walking around the house during the night.
2. The patient was diagnosed with somnambulism after several episodes of sleepwalking were reported.
3. He had no memory of the somnambulism episode the next morning.
4. The somnambulism was causing him to wake up tired and groggy.
5. She was worried about her child's somnambulism and sought medical advice.