Please choose the correct ending to complete the given sentence: Travel: [header] How to sleep in your car on a road trip [title] Bring comfortable bedding. [step] Whether you're parking for the night or taking a couple hours' snooze break while your friend drives, you'll need to make up for the car's environment. While not impossible to sleep in cars as-is, it can be uncomfortable.

Ending1: Make sure you don't end up as a backseat passenger. [substeps] Make sure your bed is at a comfortable height. Ending2: You'll probably bring a bit more if you plan to sleep overnight and not just during the drive. [substeps] Must-haves are pillows and blankets, or a sleeping bag if you are traveling through regions with cold temperatures. Ending3: Before you reach for your ipod or tablet, check the amenities and warmth preferences page or any other amenities available on your car. [title] Gather your bag and sit in the car for a few minutes. Ending4: If you've built up a valuable car fully equipped, you won't have to buy it anymore when you park your car. [substeps] When travelling with friends in a car, warm up a short microwave.

Answer format: ending1/ending2/ending3/ending4