thank you for posting your query in healthcaremagic.com.... well there are many reasons for swelling of foot and ankles at night and in some of the reasons they can tend back to normal in the morning... you have not mentioned whether you are hypertensive or diabetic or you have any other symptoms or not... kindly come back to me with these answers and i will be able to diagnose your problem better.... swelling of foot can be due to local causes as well heart or kidney problems or hypertension etc... so i would suggest you the following investigations- blood pressure measurement regularly complete blood count blood urea creatinine lipid profile fasting blood sugar come back to me with the reports... hope this was helpful.... regards