What you are experiencing is, in all likelihood, normal. Swelling that comes with reclining and goes away a while after you get up is usually not a dangerous situation, although it is always helpful to check in with your doctor to be sure.
Particularly in the head and face, when we lie down, we lose the effect that gravity provides in the upright position- gravity pulls any excess fluid down, which is why you might notice that your feet may swell during the day but be better in the morning.
The fluid that gravity causes to flow down to your trunk and to your legs gets re-distributed when you lay down, and all of your body parts, including your head, are at the same vertical level. Areas that have recently had surgery are more susceptible to swelling because the healing process may allow fluid to accumulate more in areas where the blood vessels and other drainage vessels are still regenerating.
This is the reason that we often ask patients to elevate the head of their bed at night- to keep the head and face at a higher level than the rest of the body, so gravity can help us with the swelling.
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