Table 1: Sleep data.

From: Generalization of word meanings during infant sleep

Total sleep time (min)44.79±21.13
Sleep stages—time in min
 Wake1.36±1.51
 Stage 11.13±0.90
 Stage 25.93±6.40
 Stage 311.45±6.80
 Stage 423.19±12.40
 REM3.08±4.61
  
Sleep stages—% of TST
 Wake2.83±3.59
 Stage 13.00±2.92
 Stage 212.09±9.75
 Stage 325.91±13.28
 Stage 450.39±18.15
 REM5.29±7.81
  
Spindles
 Peak frequency (in Hz)13.86±0.82
 Count (total number)130.79±63.22
 Density (average number (30sec)−1)1.82±0.32
 Length (in sec)0.96±0.12
 Amplitude (in μV)32.81±10.45
  1. REM, rapid eye movement; TST, total sleep time.
  2. Mean (±s.d.) TST and time spent awake, in NonREM sleep stages 1, 2, 3, 4 and REM sleep in minutes and percentage of total sleep time (N=42), and spindle parameters (N=38).