Yesterday and the Day Before

For the last couple of days, I have taken afternoon naps for 1-2 hours (leaning more to 2 hrs plus than less), even though there has been no feeling of fatigue in my body when I awake or after I have been up for several hours... Plus, there has been no afternoon naps taken for the last two weeks either once this thyroid medication got into my system... So, have I relapsed? Or, is this just an anomaly and should be ignored?  I felt sleepy but was not tired when I sent to the bedroom to lay down...  and, it was more trying to ease my back tension more than anything else.

According to the Mayo Clinic:

What is the best way to take a nap?

To get the most out of a nap, follow these tips:
1.  Keep naps short. Aim to nap for only 10 to 20 minutes. The longer you nap, the more likely you are to feel groggy afterward. However, young adults might be able to tolerate longer naps.
2.  Take naps in the early afternoon. Napping after 3 p.m. can interfere with nighttime sleep. Individual factors, such as your need for sleep, your sleeping schedule, your age and your medication use, also can play a role in determining the best time of day to nap.
3. Create a restful environment. Nap in a quiet, dark place with a comfortable room temperature and few distractions.
4.  After napping, give yourself time to wake up before resuming activities — particularly those that require a quick or sharp response.