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Best is to avoid all medications during pregnancy
except those which are actually prescribed to you. Unisom is actually indicated to relieve occasional sleeplessness
. If your sleeplessness persists for more than two weeks, you should consult a physician rather then trying OTCs.
Sleeplessness which persist longer may be a symptom of serious underlying medical illness.
Unisom is generally considered safe by the FDA & is available over the counter.
It is also considered safe to take while pregnant provided you take according to the directions given to you by your healthcare provider.
Wish you good health & sound sleep without any drug. Take care.