For a healthy adult, normal levels are 72 mg/dL to 108 mg/dL (4 to 6 mmol/l), Dr. Slinkin notes. The concentration of glucose in the blood of a healthy person in the morning on an empty stomach is from 68 mg/dL to 108 mg/dL (3.8 and 6.0 mmol/l). Two hours after eating food or drinks rich in carbohydrates, these values usually range from 120 to 140 mg/dL (6.7 and 7.8 mmol/l)Children FBS. For children under 6, the desired level before meals ranges from 100 mg/dL (5.5 mmol/l) to 180 mg/dL (10 mmol/l), Denis says. Before bedtime, the values should be between 110 mg/dL (6.1 mmol/l) and 200 mg/dL (11.1 mmol/l). For children FBS aged 6 to 12 years before meals, blood sugar levels should be between 90 mg/dL (5 mmol/l) and 180 mg/dL (10 mmol/l). Before bedtime, blood sugar levels should be between 100 mg/dL (5.5 mmol/l) and 180 mg/dL (10 mmol/l).Children aged 13 to 19 years should expect readings similar to those of adult.
Table of blood sugar levels.

Fasting Blood Sugar

Blood sugar levels FBS rise and fall during the day. It’s okay. However, sharp fluctuations in blood glucose levels may indicate a problem. Dramatic changes in blood sugar levels have significant physical symptoms and increase the risk of diabetes complications.
  Click on the image below to view a diagram with higher blood sugar levels.Avoid having sugar snacks late at night. If you have diabetes FBS and are constantly experiencing bursts of nightly fasting, you may have to change your meal schedule. Eating late at night foods that contain a lot of sugar or are easily convertible into sugar, such as simple carbohydrates, can lead to higher sugar levels at your post.There are some diabetics who snack before going to bed to prevent their blood sugar levels from being too low, called hypoglycemia. However, regular episodes of hypoglycemia indicate that your medication and insulin schedule should be adjusted by your doctor.An image called “Put down your lean blood sugar step 2”.
Lower your blood sugar level FBS before you go to sleep. High levels of morning glucose may be caused by the fact that you are at a high level before bedtime. Make sure you check your glucose level before going to bed and reduce it if it is too high. You can do this with insulin, medication or evening exercise.An image called “Put down your lean blood sugar step 3”. Adjust your insulin schedule. If you take insulin regularly and have morning blood sugar bursts, you should talk to your doctor about the problem. Your doctor should work on correcting your schedule or the amount or type of insulin you are taking to account for this spike.