Sleep. Diazepam may make you feel very sleepy, and this can carry on into the next day. Some people find it more difficult to get to sleep when taking diazepam or may experience nightmares or strange dreams when taking.
Other research has suggested that when taken in the longer term, a change in the dosage of diazepam (Valium) does affect weight (Frisbie, & Aguilera, 1995). Specifically, the research found that taking diazepam (Valium) for up to 10 months.