Polygraphical sleep recordings in insomniac patients under zopiclone or nitrazepam
Related Experiment Video
Updated: Oct 23, 2026

Polygraphic Recording Procedure for Measuring Sleep in Mice
Published on: January 25, 2016
Abstract:
Zopiclone, a new hypnotic with an original chemical structure, was compared in a sleep laboratory study with nitrazepam according to a double-blind, parallel group randomized design. Zopiclone (7.5 mg) and nitrazepam (5 mg) were each given for 14 nights to 5 insomniacs; a placebo washout period of 4 nights and a placebo withdrawal period of 10 nights were included in the design. Both drugs were found to be immediately and lastingly effective. Some slight insomnia rebound was found with nitrazepam, but not with zopiclone. Stage 2 was decreased, slow wave sleep (SWS) increased, and rapid eye movement unchanged by both drugs: however, only nitrazepam increased rapid eye movement latency. The differences between the effects of the drugs were quite limited. However, 3 out of 50 comparisons favoured zopiclone and none nitrazepam.
Related Concept Videos
CNS Depressants: Barbiturates and Benzodiazepines
Sedatives and Hypnotics: Overview
Sedative-hypnotics are categorized into barbiturates, benzodiazepines (BZDs), and non-benzodiazepines or Z-drugs. These drugs work by suppressing central nervous system activity, and this suppression is dose-dependent. Older sedative medications, like barbiturates, follow a linear curve in...
Management of Insomnia
Sedatives and Hypnotics Drugs: Benzodiazepines
Benzodiazepines work by enhancing the effects of the inhibitory neurotransmitter GABA. They bind to the GABAA receptor, increasing its affinity for GABA, which opens chloride...
Sedatives and Hypnotics Drugs: Miscellaneous Agents
Melatonin congeners like ramelteon (Rozerem) and tasimelteon (Hetlioz) selectively bind to melatonin receptors (MT1 and MT2) and thus mimic the actions of melatonin, a hormone that regulates sleep-wake cycles. Tasimelteon is primarily used for non-24-hour sleep-wake disorder, common in blind patients. They are also used to treat conditions like insomnia...
Sleepwalking and Sleep Talking
Factors that increase the likelihood of sleepwalking include sleep deprivation and alcohol consumption. Contrary to common beliefs, it is safe...

