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Table 1 Score of St. Mary's hospital sleep questionnaire (Study 2)

From: Effects of L-serine ingestion on human sleep

Subjective symptom after awake Placebo L-serine P-value
Was your Sleep? light < deep 3.4 ± 0.8 4.6 ± 1.7 0.09
How many times did you wake up? time(s) 2.5 ± 2.0 1.9 ± 0.7 0.80
How well did you sleep last night? badly < well 3.1 ± 0.8 4.2 ± 1.0 0.04
How clear-headed did you feel after getting up this morning? still very drowsy < alert 2.1 ± 1.0 3.1 ± 1.1 0.06
How satisfied were you with last night's sleep? unstisfied < satisfied 2.3 ± 0.7 3.3 ± 0.6 0.03
Were you troubled by waking early and being unable to get off to sleep no < yes 1.2 ± 0.4 1.1 ± 0.2 0.18
How much difficulty did you have in getting off to sleep last night? none or very little < difficult 1.5 ± 0.3 1.2 ± 0.3 0.15
How long did it take your to fall asleep last night. mins 18.4 ± 14.9 12.9 ± 9.9 0.73
  1. Values are means ± SD. n =7.
  2. Significant difference compared to Placebo by Wilcoxon's signed rank test.