The act of your dog sleeping next to you shows its natural instincts and its bond with you and its need for emotional safety. Animals need to sleep in safe locations because their sleep mode makes them defenseless. Dogs developed social behavior which makes them sleep with others to stay warm and protected. The instinct which dogs possess now focuses on their most loved human. The following explanation shows why your dog sleeps close to you at night.
Your Scent Reduces Stress

A dog’s sense of smell is far stronger than ours. Your body scent provides dogs with a sense of comfort because they recognize it as familiar. Research shows that dogs experience lower stress levels when they encounter familiar smells because this helps them handle separation from their owners.
Strengthens Bonding Hormones

Humans and dogs change through soft touch and physical closeness. The hormone establishes social connections which people develop through frequent interactions with others.
Warmth Mimics Pack Resting Behavior

Wild canines sleep together to maintain their body temperature. Your body heat creates a natural source of comfort for small dog breeds and dogs who choose to sleep in warm areas.
Feel Emotionally Tuned to You

Dogs detect human breathing patterns and heart rhythms through their observation during still periods. Dogs use this resting space to achieve deeper states of relaxation which help them settle down.
Routine Builds Emotional Predictability

Dogs thrive on predictable patterns. The shared sleeping time which occurs every night at bedtime creates a feeling of comfort which produces emotional stability for dogs.
Subtle Protective Instinct

Companion dog breeds keep their alertness during sleep. Their proximity to you enables them to detect environmental changes while they maintain their bond with you.
Reinforces Social Ranking

Dogs organize their social relationships to include only those individuals whom they trust. When dogs choose to sleep next to you they demonstrate that you play a vital role in their daily existence.