Research output: Contribution to journal › Article › Academic › peer-review
Dim light at night disturbs the daily sleep-wake cycle in the rat. / Stenvers, Dirk Jan; van Dorp, Rick; Foppen, Ewout et al.
In: Scientific reports, Vol. 6, 2016, p. 35662.Research output: Contribution to journal › Article › Academic › peer-review
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TY - JOUR
T1 - Dim light at night disturbs the daily sleep-wake cycle in the rat
AU - Stenvers, Dirk Jan
AU - van Dorp, Rick
AU - Foppen, Ewout
AU - Mendoza, Jorge
AU - Opperhuizen, Anne-Loes
AU - Fliers, Eric
AU - Bisschop, Peter H.
AU - Meijer, Johanna H.
AU - Kalsbeek, Andries
AU - Deboer, Tom
PY - 2016
Y1 - 2016
N2 - Exposure to light at night (LAN) is associated with insomnia in humans. Light provides the main input to the master clock in the hypothalamic suprachiasmatic nucleus (SCN) that coordinates the sleep-wake cycle. We aimed to develop a rodent model for the effects of LAN on sleep. Therefore, we exposed male Wistar rats to either a 12 h light (150-200lux):12 h dark (LD) schedule or a 12 h light (150-200 lux):12 h dim white light (5 lux) (LDim) schedule. LDim acutely decreased the amplitude of daily rhythms of REM and NREM sleep, with a further decrease over the following days. LDim diminished the rhythms of 1) the circadian 16-19 Hz frequency domain within the NREM sleep EEG, and 2) SCN clock gene expression. LDim also induced internal desynchronization in locomotor activity by introducing a free running rhythm with a period of similar to 25 h next to the entrained 24 h rhythm. LDim did not affect body weight or glucose tolerance. In conclusion, we introduce the first rodent model for disturbed circadian control of sleep due to LAN. We show that internal desynchronization is possible in a 24 h L:D cycle which suggests that a similar desynchronization may explain the association between LAN and human insomnia
AB - Exposure to light at night (LAN) is associated with insomnia in humans. Light provides the main input to the master clock in the hypothalamic suprachiasmatic nucleus (SCN) that coordinates the sleep-wake cycle. We aimed to develop a rodent model for the effects of LAN on sleep. Therefore, we exposed male Wistar rats to either a 12 h light (150-200lux):12 h dark (LD) schedule or a 12 h light (150-200 lux):12 h dim white light (5 lux) (LDim) schedule. LDim acutely decreased the amplitude of daily rhythms of REM and NREM sleep, with a further decrease over the following days. LDim diminished the rhythms of 1) the circadian 16-19 Hz frequency domain within the NREM sleep EEG, and 2) SCN clock gene expression. LDim also induced internal desynchronization in locomotor activity by introducing a free running rhythm with a period of similar to 25 h next to the entrained 24 h rhythm. LDim did not affect body weight or glucose tolerance. In conclusion, we introduce the first rodent model for disturbed circadian control of sleep due to LAN. We show that internal desynchronization is possible in a 24 h L:D cycle which suggests that a similar desynchronization may explain the association between LAN and human insomnia
U2 - 10.1038/srep35662
DO - 10.1038/srep35662
M3 - Article
C2 - 27762290
VL - 6
SP - 35662
JO - Scientific reports
JF - Scientific reports
SN - 2045-2322
ER -
ID: 3004214