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Recline yourself. Make your sleep site more comfortable. Use your blanket. Try to approximate your sleep routine.
Leaning yourself back at an angle of about forty degrees is recommended when trying to sleep upright. If you are in a seat on an airplane, train, bus, etc. it may lean back slightly. If you are elsewhere, a reclining armchair is a good choice if you can find one. Otherwise, just lean against a surface at a slight angle. If you are not sleeping in a chair or other surface that is cushioned, you will want to make things more comfortable using the bedding you gathered. Even if your site is already cushioned, you may find a blanket and pillow makes things more comfortable for you.  Put a blanket, pillow, or mat on the ground or floor underneath you.  Put a blanket, pillow, cushion, or other padding behind you. This will provide support for your back.  Roll up a blanket or towel and place it or a small pillow behind you at your lower back. This will provide extra support for your lumbar region and minimize soreness. Place a thin pillow behind your neck. This will allow your head to fall slightly backwards, which can make it easier to fall asleep. Specialty neck pillows are made for this purpose, but you can use whatever you have available. Once you've prepared your sleep site and cushioned support, lean back and use your blanket to cover you. This can provide warmth and comfort, making it easier for you to fall asleep. If you don't have a blanket, try using a coat, sweater, or anything similar that's available. Read a book, listen to music, or whatever else helps you relax and go to sleep. Even though you are sitting up, this routine can help you fall asleep as you normally would.  Many people find that warm drinks or tea can help them become comfortable and sleepy (just stay away from caffeinated beverages). Chamomile tea is a good choice because it has a calming effect and is naturally caffeine-free.  Meditation and/or breathing exercises are also recognized as calming techniques. A simple breathing exercise is to inhale for a count of 3 or 4, then exhale for a count of six or eight. A few repetitions of this can be very helpful when trying to calm down and go to sleep sitting up. Avoid television, computers, tablets, smartphones and similar devices when you are trying to go sleep sitting up, as the blue light from electronic screens disrupts the body's inclination to sleep.  Don't get discouraged if you don't fall asleep immediately. Just try to relax and get the best rest you can.