It is called delta sleep because of the presence of high amplitude, low frequency delta waves that are seen to occur in the EEG.
这个阶段的脑电图以高幅低频的三角形delta波为主，所以被称为Delta睡眠。
During sleep, the researchers found, alpha waves are still present—they're just drowned out by the theta and delta waves, like the din of a noisy restaurant drowns out individual conversations.
研究人员发现，α波在睡眠期间仍然存在——它们只是被θ波和δ波所掩盖了，就如同餐厅中个别的谈话被喧嚣嘈杂的声音淹没一样。
Results: The first night recordings showed longer sleep latency, decreased sleep efficiency and shorter delta and REM sleep.
结果发现，第一晚的睡眠潜伏期延长，睡眠效率下降，深睡期和快动眼睡眠期减少。
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