“If I look for Sheol to be my house.” Job is saying, “If I wait for Sheol to be the home where I am….” Sheol is the state of being dead. Job knows that if he dies he will be truly dead, not alive in any form or place. Job does not mention that if he dies he will live in heaven, “Hell” or any other place, he knows he will be dead, lifeless. [For more information on the dead being truly dead, see Appendix 4, “The Dead are Dead”].
“spread out my bed in the darkness.” In biblical times the “bed” was thick blankets that were rolled up during the day and spread out at night. Job speaks as if he spread out his bed “in the darkness,” that is, in the darkness of death.