It has been shown[1] that even small sources of light can inhibit the secretion of melatonin (the hormone that regulates the circadian rhythm and consequently sleep).
If you use eyeshades, you might feel more rested in the morning (if your bedrooms is not already pitch black dark, that is).
As a personal anecdote, I always feel less rested when I don't use eyeshades.
It has been shown[1] that even small sources of light can inhibit the secretion of melatonin (the hormone that regulates the circadian rhythm and consequently sleep).
If you use eyeshades, you might feel more rested in the morning (if your bedrooms is not already pitch black dark, that is).
As a personal anecdote, I always feel less rested when I don't use eyeshades.
[1] https://www.ncbi.nlm.nih.gov/pubmed/3567262