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. Author manuscript; available in PMC: 2008 Sep 13.
Published in final edited form as: Sleep Med. 2006 Sep 22;7(7):567–572. doi: 10.1016/j.sleep.2006.03.019

Fig. 1.

Fig. 1

Mean ± SEM of latency to persistent sleep (LPS) in groups with low and high scores on the Ford Insomnia Response to Stress Test (FIRST) during the No caffeine and caffeine night. *P=0.04 vs. Low FIRST caffeine group.