Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to wake up a cat [title] Recognize the sleep stage. [step] Normally, it's fine to wake a sleeping cat. However, there are two stages of sleep that are important to a cat's well-being: rapid eye movement (rem) sleep and non-rem (nrem) sleep, also called deep sleep.

Ending1: [substeps] Rem sleep is generally all cats are given. However, jade cats may be given more than one sleep cycle. Ending2: If a cat is deprived of these sleep stages, he may become irritable or lethargic. If you think your cat is in rem sleep or deep sleep, you may want to let him be. Ending3: [substeps] When cats lie in deep sleep, the eyes go momentarily opaque. People use cat's eye drops (gha) for this reason. Ending4: [substeps] The rem stage is when the cat is deeply asleep, without moving. The rem stage of sleep is especially time-consuming because the tarantula is the only animal with rem.

Answer format: ending1/ending2/ending3/ending4