 Disrupting the birds' natural observance of light and dark cycles can disrupt circadian rhythmsand eventually harm vital sleeping patterns. For example, biologist Thomas Raap conducted a study that suggested exposure to ALAN affected the sleep behavior of great blue tits (Cyanistes caeruleus).
<clarity>  Disrupting the birds' natural observance of light and dark cycles can disrupt circadian rhythmsand eventually harm vital sleeping patterns. For example, biologist Thomas Raap conducted a study that suggested exposure to ALAN affected the sleep behavior of great blue tits (Cyanistes caeruleus).
 Disrupting the birds' natural observance of light and dark cycles can impact circadian rhythms, eventually harming sleep patterns. Biologist Thomas Raap conducted a study that suggested exposure to ALAN affected the sleep behavior of great blue tits (Cyanistes caeruleus).