Unfortunately, sleep aids are not recommended for use in pregnant women. There are some "best practices" that you may want to try such as creating a relaxing sleep environment (make sure your bed is comfortable, keep your bedroom at a controlled temperature, minimize light and noise, and remove clocks so they cannot be seen from the bed), establish a regular sleep schedule (basically going to bed and waking up around the same time each day), avoiding naps during the day, establishing a relaxing bedtime routine, and avoid activities such as watching television in bed.
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