According to a recent review data related to sleep patterns among the toddler/preschool age group are lacking (Galland et al., 2012). The objective of the present study is to describe sleep patterns in a sample of Portuguese preschool children (3, 4 and 5-year-old children). A sleep questionnaire was completed by parents (mostly mothers, 88.7%) of preschool aged children who attended 5 schools located at 4 different cities in the central region of Portugal. These schools were selected as they shared similar daytime activities and routines. Data of 168 children were collected (Mean age = 4.17 years; SD = .838; 53% boys). In school days 3-year-old children showed later bedtimes ( M = 21:51, SD = 0:35) than 4-year old ( M = 21:34, SD = 0:35, p = .026) or 5-year-old children ( M = 21:30, SD = 0:32, p = .007); sleep duration was also shorter in 3-year-old children ( M = 09:43; SD = 0:48) than in 4-year-old ( M = 10:03; SD = 0:39, p = .031) and 5-year-old children ( M = 10:11, SD = 0:41, p = .003). Wake up time was not significantly different between age groups (3 years: M = 7:57, SD = 0:30; 4 years: M = 7:48, SD = 0:27; 5 years: M = 07:51, SD = 0:32, p > .05). Results by gender revealed that in school days 3-year-old girls had later bedtimes ( M = 21:50, SD = 0:26) and slept less ( M = 9:40; SD = 0:50) than 5-year-old girls (Bedtime: M = 21:22, SD = 0:32, p = .009; Sleep duration: M = 10:21; SD = 0:40, p = .005). Younger girls also experienced more night awakenings (3-year-old: 61%) than older girls (5-year-old: 22.2%, p = .004). Boys with 3 years required more often an object to fall asleep (76.7%) than boys with 4 years (32.4%, p < .001) or 5 years old (24.0%, p < .001). In comparison to children who never/occasionally needed parents to fall asleep in school days, children who always/frequently needed their help, slept less ( M = 10:05, SD = 0:42 vs. M = 9:51, SD = 0:46, p = .038) experienced more night awakenings (37.6% vs. 54.1%, p = .034), had more difficulties getting back to sleep alone after night awakenings (14.3% vs. 43.7%, < .001) were more afraid of the dark (20.4%, vs. 34.2%, p = .034) but showed less bedtime resistance (83.9% vs. 71.6%, p = .043). Throughout early child development night sleep becomes more consolidated. Parents help to sleep is associated with more disturbed sleep in preschool aged children but less bedtime resistance. The collaboration of Parents (particularly Mothers), School Directors and Teachers is deeply acknowledged.
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