| APA | Smart Define. (1970). much more difficult to fall asleep thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/much_more_difficult_to_fall_asleep/thesaurus/broader |
| Chicago | Smart Define. 1970. "much more difficult to fall asleep thesaurus" https://smartdefine.org/much_more_difficult_to_fall_asleep/thesaurus/broader (accessed September 20, 2026). |
| Harvard | Smart Define 1970, much more difficult to fall asleep thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/much_more_difficult_to_fall_asleep/thesaurus/broader>. |
| MLA | Smart Define. "much more difficult to fall asleep thesaurus" 1 January 1970. Web. 20 September 2026. <https://smartdefine.org/much_more_difficult_to_fall_asleep/thesaurus/broader> |