1. Personal habits and comfort: Men may be accustomed to sleeping alone, feeling more comfortable and free, and do not like to be constrained or disturbed. Embracing a woman may make him feel physically restricted and affect his sleep quality.
2. Sleep differences: There may be differences in sleep habits between men and women, such as turning frequency and temperature control. These differences may cause discomfort for both parties when sleeping with each other, so he is more inclined to sleep separately.
3. Emotional expression: Not all men express love or intimacy through physical contact. He may think that other ways can better reflect his care and love, rather than necessarily expressing it by sleeping with a woman in his arms.