Yes, it's generally fine to leave sea salt spray in your hair for one night. Sea salt spray can help create texture and enhance waves in your hair, and many people use it as a styling product. However, keep in mind that salt can potentially dry your hair out over time, especially if you use it frequently.
If you tend to have dry or damaged hair, you might want to consider using a leave-in conditioner or moisturizing treatment the next day to counteract any dryness from the salt. Additionally, make sure to wash your hair thoroughly after a few uses to prevent any buildup. If you have specific hair concerns, it might be a good idea to consult a hairstylist for personalized advice.