Babies have an immature nervous system, and it is not uncommon for sleeping babies to
experience an involuntary motor response known as the Moro reflex. This reflex can cause
supine sleeping babies to startle and wake themselves up in the middle of the night. The
SNOO’s special Sleep Sack keeps babies’ arms snug and secure for better sleep efficiency.
Additionally, SNOO Sleep Sack’s wing loops are an essential safety feature. SNOO will not turn
on until the caregiver fully slides the wing loops onto the bed’s safety clips. This is also a design
element to keep infants safely on the back – the AAP’s recommended sleep position – during all
sleep episodes.