Yes, a husband and wife can sleep together during her period. There is no hygienic reason to prevent this. In fact, cuddling releases endorphins which can be beneficial.
Cultural and Religious Considerations
While there's no inherent health reason to avoid sleeping together during menstruation, some cultural and religious practices advise against it. For example:
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Certain Jewish practices: Orthodox Jewish tradition dictates a period of niddah following menstruation, during which sexual intimacy is prohibited. This affects sleeping arrangements as well. See this Quora discussion and this Mi Yodeya question](https://judaism.stackexchange.com/questions/51128/married-couples-never-sleeping-in-the-same-bed). Similar restrictions exist in some other religious traditions. See this article on Islamic views.
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Historical Practices: Historically, sleeping arrangements varied widely. Separate bedrooms were common in some eras and cultures for various reasons, not solely related to menstruation. See this Reddit discussion. These practices were often driven by factors such as comfort, temperature regulation, or other social customs.
Modern Perspectives
Modern medical consensus suggests no health risks are associated with sleeping together during menstruation. [Source: Various online sources and personal statements supporting this idea]. The choice is ultimately a personal one, based on individual preferences, comfort levels, and religious or cultural beliefs. See this TIME article on sex during periods.
