# 褪黑激素本身並不是強力的助眠劑,至少對沒有時差的健康人來說不是(我們稍後會探討時差,還有褪黑激素的助益)。而且在褪黑激素藥丸中,品質達標的褪黑激素其實很少(如果有的話)。話雖如此,褪黑激素對睡眠有明顯的安慰劑效應,不應低估,畢竟安慰劑效應是整個藥理學中最可靠的效應。——為什麼要睡覺?
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