How do field mice sleep? - briefly
Field mice rest in brief bouts of a few minutes, usually within concealed burrows or nests lined with shredded vegetation. They curl into a tight ball to conserve heat and minimize predator exposure.
How do field mice sleep? - in detail
Field mice exhibit nocturnal sleep cycles, entering deep rest periods shortly after sunset and awakening before dawn. Their circadian rhythm is regulated by melatonin secretion, which peaks during the dark phase and declines with morning light, prompting a predictable pattern of inactivity.
During rest, individuals select concealed microhabitats such as burrow chambers, dense vegetation, or beneath leaf litter. These sites provide thermal insulation, predator avoidance, and humidity control. The chosen shelter often contains a nest constructed of shredded plant material, fur, and dried grasses, which cushions the body and retains warmth.
Physiological aspects of their sleep include:
- Rapid eye movement (REM) and non‑REM phases: EEG studies show alternating cycles lasting 30–45 seconds, proportionally shorter than in larger mammals.
- Body temperature regulation: Core temperature drops by 1–2 °C during non‑REM, conserving energy.
- Heart rate reduction: Beats decrease from 500–600 bpm in active states to 300–350 bpm while sleeping.
- Muscle tone: Minimal tension is maintained, allowing quick response to sudden threats.
Field mice typically sleep for 6–8 hours per night, punctuated by brief arousals lasting a few seconds. These micro‑awakenings enable the animal to scan for predators and adjust nest conditions. In colder months, sleep duration may extend, and nest depth increases to maintain a stable microclimate.