Summarize this article in one sentence.
Work in an upwards motion along your top lashes, and a downwards motion on your bottom lashes. Use a similar motion as you would when applying mascara. This will set your lashes in the proper shape and minimize their tangling while you sleep.  To avoid poking your eyes with the brush, close one eye and brush upwards on those lashes. Then repeat the process for the other eye. Purchase a spoolie brush in the beauty or cosmetic section at a local department store, or online with major retailers. A spoolie brush looks like a mascara applicator and can be used to comb your eyelashes and eyebrows. Refrain from using oil-based products, as the oil will deteriorate the eyelash adhesive. To find out if a product is oil-free, read the manufacturer's ingredients label on the back of the bottle. Most oil-free products will clearly advertise themselves as such. If you still aren't sure what products to use, ask a staff member at the salon where you got your lashes done. The staff is knowledgeable and will be able to suggest alternative oil-free products. Put some of the cleanser on a cotton swab, and gently pat the skin around your eyes to remove makeup or dirt. Continue this process until all of the makeup has been removed. You will have more control using a cotton swab over a cotton pad to remove the makeup, and won't bump your eyelashes as much.  Use oil-free makeup removers like micellar cleansers to remove the makeup from around your eyes. If you opt to use a cotton pad with the cleanser, dab your eyelids instead of rubbing them to remove the makeup, as excess rubbing will damage the lashes and cause shedding. Apply mascara to your eyelash extensions sparingly to avoid weakening the follicles. Not only do most mascaras contain oil that will break down the adhesive on your lashes, but the mascara will require you to rub the lashes to remove it. Use the lash cleanser and instructions that your eyelash technician gave you. This will maintain the strength and cleanliness of your lashes. This typically involves applying the cleaning solution with a small makeup brush using circular motions, and then patting the eyelashes dry. If you run out of eyelash cleaner or did not receive any, use an oil-free baby shampoo diluted with water as an alternative. Use a towel to gently dry your face, and be extra careful when drying the skin around your eyes. Avoid rubbing or dragging the towel across your face to dry it, as this might cause some of the lashes to fall out. Eyelash extensions can take quite a while to dry, which can leave them feeling unnaturally heavy. Use a hairdryer on the lowest setting to gently speed up the air-drying process.

Summary:
Use a spoolie brush to comb your lashes before you go to bed. Use oil-free products to clean and moisturize your face. Use a cotton swab with makeup remover to carefully wipe off eye makeup. Wash your lashes nightly or at least once a week to keep them clean. Pat your face dry with a towel after washing to avoid dislodging the lashes.