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. 2013 May 16;2013:910104. doi: 10.1155/2013/910104

Table 4.

Consumption of energy drinks, caffeinated beverages and stimulants in relation to sleep quality status.

Exposure Good sleep quality (N = 401) Poor sleep quality (N = 431) P value
n (%) n (%)
Any stimulant beverages
 No 200 (50.4) 171 (41.2) <0.01
 Yes 197 (49.6) 244 (58.8)
 Type of beverage
  Coke/Pepsi with sugar 178 (44.4) 193 (44.8) 0.910
  Coke/Pepsi sugar-free 17 (4.2) 32 (7.4) 0.051
  Red Bull 65 (16.2) 108 (25.1) <0.01
  Dark Dog 31 (7.7) 53 (12.3) 0.029
  Other energy drinks* 11 (2.7) 22 (5.1) 0.081
Coffee
 No 188 (46.9) 179 (41.5) 0.120
 Yes 213 (53.1) 252 (58.5)
  With sugar 140 (34.9) 147 (34.1) 0.807
  Sugar-free 73 (18.2) 105 (24.4) 0.031
Tea
 No 328 (81.8) 341 (79.1) 0.331
 Yes 73 (18.2) 90 (20.9)
  With sugar 4 (1.0) 5 (0.6) 0.821
  Sugar-free 69 (17.2) 85 (19.7) 0.351
Number of stimulant beverages/week
  0 141 (35.2) 121 (28.1) 0.073
  1 64 (16.0) 76 (17.6)
  2 106 (26.4) 110 (25.5)
  ≥3 90 (22.4) 124 (28.8)

*Other energy drinks include the following: Burn, Shark, Red Devil, and Battery.