Just like adults, babies can also be too tired to fall asleep because they get overwhelmed by changes in their routine or are overly exhausted from a day of constant activities. (mommysbliss.com)
Dogs that, according to the owner, avoid other dogs and seek constant activity maintained a longer distance from their group mates during the walks. (journals.plos.org)
When these babies grow, they seem to require constant activity as they've grown to see this activity as the norm. (dunstanbaby.com)