Dear Sir Thanks for writing to us. It is quite unusual to have your heart rate increased only when you hit the bed. If you are sure that it is not increased at daytime? Does it start racing as soon as you lie down or it increases only when you suddenly woke up from early sleep? If you get it just on lying down without any trouble (like shortness of breath, chest discomfort)? If it is so and it occurs daily, I would like you to get a holter monitor done so that rhythm at the time of episode can be picked up. This will help in further work-up and ascertaining the cause. In case there are additional symptoms, you will require a cardiac ultrasound also. Hope this helps. Sincerely Sukhvinder