Pajamas
Pajamas are a clothing item obtained from the Pajama Cubby as part of the Somnium Synthesizer story trait. Once dispensed, Pajamas can be assigned to Duplicants. Unlike other clothes, they are not constructed, but they can be obtained in infinite quantity by operating the Pajama Cubby with a Duplicant. The main benefit of Pajamas is that they allow Duplicants to produce Dream Journals while they sleep (1 every 300 s of sleep).
They increase Decor by 30 and increase the conductivity barrier to 0.5 cm from the default insulation factor of 0.25 cm. (This is in addition to the 0.2 cm of insulation afforded by the stunningly thick skin of Duplicants.) Pajamas also greatly reduce Duplicants' Athletics (lowering their running speed correspondingly) and increases their Stamina loss by 10%/cycle. The increased Stamina loss means that Pajama-wearing Duplicants will tire sooner each cycle, so changes to their Schedule may be necessary to prevent them from passing out from exhaustion.
Pajamas are a free, infinitely-obtainable item composed of 4 kg of Coal. If heated past 276.9 °C530.42 °F, they will turn into 4 kg of Refined Carbon. Note that although they are an infinite resource, Pajamas will disappear when a Duplicant wearing them un-equips them.