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Roach spray usually starts working almost immediately on contact—within seconds to a few minutes. However, if it's a residual spray designed to keep killing over time, it can take hours or even days to fully affect roaches that come into contact with treated surfaces. For larger infestations, it may take at least a week to see a noticeable drop in activity, since not all roaches are exposed at once.

Brown recluse spiders are attracted to homes in search of warm, dry, and dark spots that provide easy access to insects. An existing bug problem is a primary attractant, as spiders follow their food source. Other factors that attract brown recluse spiders include the presence of anything that might lure insects, such as food left out or poorly sealed trash cans. They are also drawn to excessive outdoor lighting, untended wood or cardboard boxes, and dark areas with nooks and crannies for nesting, like woodpiles or dirt piles.

Aside from incorporating smells that roaches hate in your bedroom, such as citronella, lemongrass, or clove oil, there are a few ways you can keep roaches away at night. First, try moving your bed away from the wall, as roaches will often climb the walls and onto your bed. If you’re still having trouble, you can also purchase a mosquito tent for your bed, or hang netting from the ceiling to surround your sleeping area. Make sure it isn’t touching the ground, though, as they may attempt to climb it.

Neither the black widow nor the brown recluse are deadly spiders, and North America has no deadly species. However, other places in the world do, including Australia, which is home to the funnel web spider, considered the world’s deadliest spider. However, Australia has not reported deaths from a funnel web spider bite over the past few decades after developing an antivenom.