Sleeping less and less in 7 months of pregnancy may be caused by poor sleeping environment, hormone level change, uterus enlargement, frequent urination, calcium deficiency and so on. 1. Poor sleeping environment: sleeping environment is too noisy or sleeping environment is too bright, may affect the quality of sleep, 7 months pregnant women sleep less and less. 2. Changes in hormone levels: The levels of all hormones in the body change after pregnancy, which may make the pregnant woman feel irritable and restless, and may also make her sleep less and less. 3. Enlargement of uterus: The uterus will gradually increase in size during the 7th month of pregnancy, which will affect the sleep of the pregnant woman as it presses on the stomach and the heart. 4. Frequent urination: the growing uterus in the 7th month of pregnancy presses on the bladder and may cause frequent urination at night, which increases the frequency of urination and leads to less and less sleep at night. 5. Calcium deficiency: the body’s demand for calcium in 7 months of pregnancy is relatively large, but the calcium supplement is relatively small, the body lacks calcium after leg cramps, will also affect sleep, resulting in less and less sleep. There are more reasons why you sleep less and less in 7 months of pregnancy, and you should seek medical attention in time for serious cases.