Q: What you need for a good night's sleep in the car depends on your location, the weather, and what sort of temperatures you are acclimated to. In subzero temperatures, you will probably benefit from a couple of sleeping bags (one inside the other), in addition to a blanket and a beanie for your head.  A $60 sleeping bag will keep you warm in −20 °F (−29 °C) weather outside. In a car, you can get by with a −20 °F (−29 °C) sleeping bag.  If it gets colder, then just add an extra layer of clothing to your sleeping attire. Bring a safety pin with you to keep your sleeping bag closed if it does not draw tightly around your head. If you toss and turn in the middle of the night, it could come undone and you could wind up awake and freezing. A knit hat (knit cap, toque, ski hat, and so on) will keep you much warmer at night. Also, you can pull it over your eyes for additional darkness. A sleep mask can help you sleep more soundly. In a pinch, you can blindfold yourself with a bandanna, tie a scarf around your eyes, use a hat, and so forth. Otherwise, you may find yourself up at the crack of dawn, as it is hard to darken a car completely. No sleeping bag? Two blankets pinned together with safety pins are the next best thing. Or even sleeping under a pile of blankets. A thin cloth (like a sheet or even a towel) hung in the windows keeps bugs out and lets air in. The weather is the most important thing to consider when in this situation. Hot weather can actually be worse than cold, as you could wake up in the morning feeling sticky, gross, and covered in mosquito bites. Try opening the windows just an inch or so to find a happy medium.  You can also buy mesh to place in your windows (or sunroof). Wire mesh can be scavenged from an old screen window or door, or screening can be bought at a hardware store. Be careful of very hot temperatures in cars. Cars can heat up very quickly, and if you are in a very hot climate, such as a desert, this can be a real hazard. If you become overcome with heat, you may not wake up and realize you are close to dangerous dehydration and/or heat exhaustion. Try to think ahead, especially if you plan on spending more than one or two nights in your car. It will likely get dark out, and harder to find what you need before bedding down for the night. This likely means:  Water Flashlight Pillow (or pillow-like object), blanket or sleeping bag. Cell phone: for emergencies, for a wake-up alarm, or a game to play. Book: A little reading can make a dull night more pleasant. Coffee can with lid (for men and women with excellent aim) in case you have to pee, it may be easier to do so with a coffee can than get up in the cold or bug-filled outdoors. Hand sanitizer or baby wipes. Clean your hands before eating or after using the bathroom or any time hygiene is in doubt. Since you may have irregular access to running water, these toiletries can help prevent you from illness and keep you looking and smelling presentable. If you are in the car with others or with cargo, you will likely be sleeping sitting up. Sleeping in the car seat is not exactly the best place to sleep, but if you have to, use a travel pillow that supports your head and neck. You will wake up in the morning much happier. A tidy car makes it easier to find things, especially at night. A clean car is a pleasure to sleep in and even a few inches often makes a great difference in your comfort. Also, if it is dirty and smelly, it will be much more difficult to fall asleep.  Keep only the essentials out, like a flashlight, water, a backpack for one set of clothes (unless you are traveling), and a towel. A cleaner car also attracts less attention, especially if clean on the outside. Few people will think to ask questions of a car that looks presentable. A filthy car filled with trash and bags looks suspicious. Avoid clutter by putting things away during the day. While you do not absolutely have to roll up your sleeping bag in the back seat or fold your towel, it will look tidier from the outside and thus less suspicious. This is especially important if you are trying to not be obvious about sleeping in your car. Tarps are inexpensive, usually easy to find, and will keep prying eyes away. A tarp can help cut down on sunlight while often also allow for ample ventilation. Tarps on cars can look suspicious. Most people do not cover a car with a tarp, so this can point out a person sleeping in a car. In some places, this can be a problem, as described below.
A: For cold temperatures, buy a sleeping bag (or two). For hot temperatures, let in the air and keep out insects. Gather supplies for a comfortable night. Keep your car clean. Consider getting a tarp.

Q: Begin leaving the cage outside during the day so other sparrows can visit. If you are avoiding close interaction with the bird and it is interacting with wild sparrows, then its chances of re-acclimating to the wild are much better. If the baby bird is not interacting with wild birds then it needs to learn the songs of its species another way. This will allow it to communicate with other birds when it is released. There are audio files available online that you can play for the bird. Let it hop around on the grass after about 7-10 days old. If releasing the bird is your ultimate goal, try putting it in open space areas so they can learn to fly. Instinct will teach the bird to fly and discover what its wings are for.  Wait until it has wing feathers, then if it doesn't seem to know what to do then its probably isn't ready. To test out whether he's ready, take him outside and place him on the ground in an area that's safe from predators. Leave the bird to its own devices for 20 minutes, if nothing happens bring it back indoors and try again another day. If you're going to release it, make sure the baby can eat on its own. You also need to be sure that it is not imprinted on you. If the bird is imprinted on you, then it cannot be released into the wild. It needs to continue as a pet.
A:
Put the baby bird in a cage when it begins hopping. Give the bird more and more time outdoors. Make sure the bird is ready for release.