According to multiple sources, including a survey of 3,000 adults conducted by Premier Inn, women tend to prefer sleeping on the left side of the bed. The reasons for this preference vary, with some sources suggesting that it is for safety and security reasons, while others suggest that it is simply a matter of habit. However, it is worth noting that not all women prefer to sleep on the left side of the bed, and there are certainly exceptions to this general trend. Additionally, a survey conducted by Saatva Mattress found that overall, more Americans sleep on the right side of the bed than the left, with more men than women preferring this side. Therefore, while there may be some general trends in terms of which side of the bed women prefer to sleep on, it is ultimately a matter of personal preference and may vary from person to person.