Most animal cells exhibit anchorage dependence, which means that in order to divide

Most animal cells also exhibit anchorage dependence. To divide, they must be attached to a substratum, such as the inside of a culture jar or the extracellular matrix of a tissue. Experiments suggest that like cell density, anchorage is signaled to the cell cycle control system via pathways involving plasma membrane proteins and elements of cytoskeleton linked to them.

Cramming you staying up all night to get a lot of work done for a class and is very stressful