1.Effects Of Sleep Inertia On Cognitive Performance Following Different Time Course Naps After 30h Sleep Deprivation In Healthy Men 2.A Cross-sectional Study On Sleep Of The Army In Zhanjiang

Objectives: To study the effects of sleep inertia of different time course sleeps on sleep stages and cognitions in healthy men after 30h sleep deprivation, and also to investigate the mechanism of cognitive functions impairment in sleep inertia stages and the influential factors of sleep inertia.Methods: 10 healthy men (age, 20.80±2.10 years) participated in the program. The program divided into 2 stages. First,Participants attended a series of tests after 20minnap(20min nap group) after 30h sleep deprivation. The series of tests including four parts: the continuous performance task, the Stroop Tests , the Addition Tests, and Stanford Sleepiness Scale. The series of tests had been done 3 times immediately after the volunteers were awoken and each lasted about 15 minutes with an interval of 10 minutes between tests. And during the nap PSG were recorded. And then the following 7 days was washing-out period to ensure a complete recovery. They repeat the same processes except 2h nap(2h nap group). The cognitive performance of times was compared across times and with the best cognitive performance in awakening to estimate whether or not the cognitive abilities regained the normal condition. The results of 20min nap group compared with that of 2h nap group.Results: (1) Sleep latency became shortening in both groups after 30h sleep deprivation. There were no SWS and REM sleep stages in 20min naps, while SWS% increased and REM% declined in 2h naps. All participants of 20min nap group awaked from sleep stage 1 or 2. 8 participants of 2h nap group awaked from sleep stage 3, 1 awaked from sleep stage 2, and 1 awaked from REM sleep. (2)In the early of SI (5min after awaking) Cognitive tasks show that the abilities of continuous attention ,selected attention and addition are all impaired. The cognitive functions impairments of 2h nap group were more severe at the initiation of sleep inertia, but regained the normal condition more quickly. Different cognitive tasks recovered at different speeds. The dispersion of SI needs 30min or more time. (3)more sleepy when the participants just awaking from SWS.Conclusions: 1. There were different of the sleep construction and awaked sleep stage between 20min nap and 2h nap groups. 2. SI can exert negativity influences on cognitive performances of the abilities of continuous attention ,selected attention and addition after SD. 3. Different cognitive performances recovered at different speeds. 4. Many factors may influence the dispersion of SI, including sleep debt, the compensation of sleep debt and circadian rhythm and so on. Objective: To study the sleep situation of the armymen in Zhanjiang. Methods: 920 armymen were investigated by The Pittsburgh Sleep Quality Index and Hospital Anxiety and Depression Scale.Results :(1)The average night sleep time were 7.18±1.22h, 70.32% persons have the habit of siesta. The total scores of PSQI were6.25±3.46,and 38.59% of the armymen sufered from sleep problems.2. The scores of anxiety(8.18±3.53) and depression(7.42±3.06) were statistically different among the armymen with different sleep quality.3. anxiety and depression were correlated with sleep quality.Conclusion: The prevalence of sleep deprivation and sleep disturbance among the armymen in Zhanjiang is comparable to those found in other places of the country and other countries. An intervention program for sleep problems in armymen should be considered.