sleep stage 1

sleep stage 1

NREMS stage 1 Sleep disorders A stage of NREM sleep that immediately follows the awake state Accounts for 4-5% of total sleep time
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The purpose of this research was to determine whether CPA makes it possible to identify and characterize changes in EEG, muscle, and cardiac activity during a two-minute segment taken from the transition between wakefulness and the F1 sleep stage 1.
Sleep-onset was established during the first phase classified as sleep stage 1 (S1) of sleep without rapid eye movements (NREM).
Sp[O.sub.2]: minimum oxyhaemoglobin saturation; N1: sleep stage 1; N2: sleep stage 2; N3: sleep stage 3; ODI: oxygen desaturation index; REM: rapid eye movement; TST: total sleep time.
(2) Nonrapid eye movement (NREM) sleep stage 1 (NREM1): this first stage of sleep is also called the drowsiness state.
The horizontal axis in Figure 2 represents sleep stages of awake stage, REM, sleep stage 1, sleep stage 2, and slow wave sleep.
Control Test TST/min 390(44) 368 (54) N1/min 42 (16, 46) 39 (17) N2/min 263 (52) 248 (40) N3/min 21 (17) 4(0, 16)* REM/min 66 (22) 70 (22) N1% 11.2 (4.0, 12.2) 10.7 (4.3) N2% 67.1 (8.7) 68.1 (7.6) N3% 5.2 (4.2) 1.3 (0.0, 4.1) REM% 17.0 (5.6) 18.4 (4.4) ArI/[h.sup.-1] 15.1 (3.1) 43.9 (9.1)([dagger]) TST, total sleep time; N1, non-rapid-eye movement sleep stage 1; N2, non- rapid-eye movement sleep stage 2; N3, non-rapid-eye movement sleep stage 3; REM, rapid-eye movement sleep; N1%, the percentage of N1; N2%, the percentage of N2; N3%, the percentage of N3; REM%, the percentage of REM; ArI, arousal index; * P < 0.05 from control condition; ([dagger]) < 0.001 from control condition.
The proportions of each sleep stage were shown as follow: the proportion of sleep Stage 1 was 9.3% [+ or -] 5.1% (range: 3.8%–17.0%); the proportion of sleep Stage 2 was 50.5% [+ or -] 8.2% (range: 37.1%–58.8%); the proportion of sleep Stage 3 was 18.4% [+ or -] 9.1% (range: 7.6%–33.7%); and the proportion of REM sleep was 21.8% [+ or -] 3.9% (range: 15.6%–26.2%).{Table 3}
However, interestingly, we discovered that the percentage of slow-wave sleep in two patients increased, and the proportion of sleep Stage 1 was also elevated in other two patients, which had rarely been reported in the scientific literature before.
Nineteen channels EEG, 2 channels horizontal EOG, and 1 channel EMG were recorded in 5 experimental conditions: (a) waking state at daytime, (b) ganzfeld, (c) waking state before sleep onset, (d) sleep stage 1, and (e) sleep stage 2.