Workout recovery for over 60

I swim about 1600-2000 meters (short course) a couple of times a week, sometimes three. I'm looking for advice on how to improve my recovery. While I'm working out I feel great, but after, and for a good 24 hours after, I feel completely wiped out. I find it difficult to sleep after a workout (takes the form of waking up a lot during the night), which feels so counter-intuitive if I'm so spent and feeling good about it. 

I have never taken vitamins or supplements, only because I've never felt I needed to. But I figure I must be nutritionally deficient in something. I'd like to improve these recovery periods. Any advice?

Parents
  • It may help to get a professional to methodically look for anything that needs attention in the basic 6-8 areas: per www. lifestylemedicine.org: Nutrition, exercise, stress management restorative sleep- the apps Sleepwatch and ICBT helped me), community/purpose, and avoid risky substances. Per Newstart Program: nutrition, exercise, water, sunshine, temperance, fresh air, rest, trust in God. This may be multifactorial, and deserves an objective, wholistic approach

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  • It may help to get a professional to methodically look for anything that needs attention in the basic 6-8 areas: per www. lifestylemedicine.org: Nutrition, exercise, stress management restorative sleep- the apps Sleepwatch and ICBT helped me), community/purpose, and avoid risky substances. Per Newstart Program: nutrition, exercise, water, sunshine, temperance, fresh air, rest, trust in God. This may be multifactorial, and deserves an objective, wholistic approach

Children