As much as any other creature, cardinals want to sleep peacefully at night. This is especially important for them because they must be alert during the day to see any dangers that may come their way. To do this, they look for a quiet spot that is covered on all sides and offers protection from predators. This is why they don’t often sleep in a birdhouse. Instead, they prefer an open house with multiple entries or exits so that they can escape quickly if they sense any danger nearby.
Cardinals will often sleep in areas that have dense foliage so that they can hide easily. This can include tangled branches, thickets of shrubs or blackberry brambles, tree cavities and chimneys. They also enjoy roosting in the high, dark foliage of tall trees. This helps them stay hidden from snakes and cats while also protecting them from nocturnal birds of prey such as owls.
Besides the fact that they need to have cover, cardinals also like their roosts to be comfortable. This means that they will often fluff up their feathers to maintain a certain temperature as they sleep. This is particularly true during the winter months when temperatures can drop dramatically at night.
One more thing to note is that cardinals will often change their sleeping spots. This is especially true if they have recently encountered any disruptions or threats. They will keep searching until they find a suitable spot.