Whether two people can sleep comfortably in a double bed depends on a variety of factors, such as their size, sleeping habits, and personal preferences. A double bed typically measures 54 inches wide by 75 inches long (137 cm x 190 cm), which can provide enough space for two people if they are small to average-sized and don't move around a lot during the night.
However, if the two people are larger in size or tend to move around a lot during sleep, a double bed may feel cramped and uncomfortable. In such cases, a larger bed such as a queen or king size bed may be a better option for a comfortable night's sleep.
It's worth noting that mattress quality and firmness can also play a role in how comfortable two people will be in a double bed. A high-quality, supportive mattress can make a significant difference in the comfort level of a bed for both people sharing it.