We investigated the relationship between length and dreamlike quality in sleep mentation reports. Reports were obtained by waking subjects at sleep onset (SO) and at 5 and 10 minutes into the second (REMP2) and fourth REM periods (REMP4). Reports were recorded, transcribed, and scored blindly for total word count (TWC) and dreamlike quality as measured by a composite dream scale score (CDS). Dreamlike quality was strongly correlated with TWC; both CDS and TWC scores increased across successively later awakenings. Significant differences were found in both TWC and CDS between SO and REMP4 and also between REMP2 and REMP4; however, differences were not significant between SO and REMP2 or between the 5 and 10 minute awakenings in REMPs 2 and 4. These findings provide further evidence that the amount of dreamlike mentation is related to the within-sleep arousal level rather than to REMP duration and that the dreamlike quality of reports increases as they become longer.

中文翻译：

---

梦幻事件与睡眠心理报告的时间长短相关。

我们在睡眠心理报告中调查了长度和梦幻般的质量之间的关系。通过在第二个（REMP2）和第四个REM期（REMP4）的睡眠发作（SO）以及5和10分钟时唤醒受试者来获得报告。记录，转录和盲目评分报告的总字数（TWC）和梦境质量（通过综合梦境评分（CDS）进行衡量）。梦幻般的品质与TWC密切相关；CDS和TWC分数在随后的后续唤醒中均增加。SO和REMP4之间以及REMP2和REMP4之间的TWC和CDS均存在显着差异；但是，SO和REMP2之间或REMP 2和4中5分钟到10分钟的唤醒之间的差异并不显着。