This may be caused by various things such as body mass index, race, age and lifestyle.
Your metabolic system may also be hampered if you have a sleep disorder. What you should not ignore is that this can be bad for you and your child. It is because children born from a mother that has rising blood sugar lever will be much larger in size than normal. In some cases, they could be much smaller in size at the time of birth. They may also have obesity growing up.
Source: http://www.pregnancy-baby-care.com/blog/pregnancy-conditions/snoring-in-pregnancy.html
