Gen Xers are most likely to say that they sleep fewer than eight hours a night (77 percent vs. 74 percent of Boomers, 66 percent of Matures and 64 percent of Millennials). They are also least likely to say they are getting enough sleep (45 percent vs. 74 percent of Matures, 56 percent of Boomers and 54 percent of Millennials).

Half of Gen Xers (49 percent) say their sleep quality is fair or poor, compared to 43 percent of Millennials, 42 percent of boomers and 28 percent of matures.

Only 24 percent of Gen Xers say they are doing a very good or excellent job at getting enough sleep, despite the majority of this generation (61 percent) who say that getting enough sleep is extremely or very important to them. A wide gap between perceived importance and achievement of sleep goals also exists for Millennials (59 percent vs. 28 percent), Boomers (64 percent vs. 30 percent) and Matures (70 percent vs. 50 percent).

Gen Xers and millennials are most likely to say lack of sleep makes them irritable (49 percent and 47 percent, respectively, vs. 30 percent of Boomers and 15 percent of Matures).

While Gen Xers report sleeping the fewest hours, Millennials report poorer sleep habits than other adults. In particular, Millennials are more likely to say they do not get at least eight hours of sleep because they stay up too late (52 percent compared with 36 percent of Gen Xers, 29 percent of Boomers and 22 percent of Matures).

Nearly one-third of Millennials also attribute lack of sleep to thinking of all the things they need to do or did not get done (31 percent compared with 27 percent of Gen Xers, 24 percent of Boomers and 14 percent of Matures).

More than one-third of Millennials say they do not sleep at least eight hours a night because they have too many things to do and do not have enough time (35 percent compared with 19 percent of Gen Xers, 13 percent of Boomers and 6 percent of Matures).

Younger Americans are also more likely to report consequences of unhealthy sleeping habits. When they do not get enough sleep, 60 percent of Millennials say they feel sluggish or lazy, compared to 58 percent of Gen Xers, 50 percent of Boomers and 37 percent of Matures; 38 percent of Millennials say they have trouble concentrating on things they need to do, compared to 32 percent of Gen Xers, 27 percent of Boomers and 11 percent of Matures; and 34 percent of Millennials say they are not motivated to take care of responsibilities, compared to 23 percent of Gen Xers, 22 percent of Boomers and 14 percent of Matures.