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Many plants have a natural reaction that allows them to take advantage of their environment. This plant likely turns its leave upwards at night to help with water collection in its natural environment. Dew would settle on the leaves and because they are more upright, that dew would run down into the root area of the plant. Then the leaves lay back flat to collect energy from the sun. It is normal and happens with many plants.

Zebra plant is a common name used for 2 very different types of plant One is a succulent of the Haworthia clan, usually quite small when you buy it, with long fleshy leaves pointed at the end. The second is a flat-leaf plant from the aphelandra species. The succulent needs to have its soil well dried out between waterings, though not completely bone dry; the leafy plant wants to stay "evenly moist", but not soaked. Move your stem to a spot in your house with more light, try to adjust the moisture per above, and watch for spider mites - they especially like aphelandra, and could also cause all the leaves to drop.

A common problem with Zebra plants is overwatering.

Here is a link to refresh you on the care requirements.

https://www.gardeningknowhow.com/houseplants/zebra-plant/zebra-houseplant-care.htm

From this description I would say it could be Powdery Mildew or Mealybug.

Mealybug is common on houseplants and can be treated.

Lightly wash the leaves and apply Neem Oil. Neem Oil works as both an insecticide and fungicide, it is also safe for people and pets.

Here are some links to help you.

https://www.gardeningknowhow.com/houseplants/zebra-plant/zebra-houseplant-care.htm
https://www.gardeningknowhow.com/houseplants/hpgen/powdery-mildew-treatment.htm
https://www.gardeningknowhow.com/plant-problems/pests/insects/mealybugs-control.htm
https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm

It's possible those are germinated seeds from the plant.

It does appear that your plant had died.
Here is a link to refresh you on the care requirements should you choose to try growing another Zebra Plant.

https://www.gardeningknowhow.com/houseplants/calathea-plants/calathea-zebra-houseplant.htm

You can cut the plant down and propagate the cutting.

Propagation: Take 3-inch (7.5 cm) stem tip cuttings in spring or summer. Cut the stem just below a node -- the place where a leaf is attached to the main stem. Dip cut ends in rooting hormone powder then insert them in seed starting mix or perlite. Enclose the potted cuttings in clear plastic or use a glass cloche to hold in humidity. Set the covered cuttings where they'll get indirect light. Water when the potting medium appears to dry out. After 3 weeks, you can remove the covering. Gradually expose the cuttings to more light. You should see new growth in about 6 weeks.
There is no way to grow new leaves at the base of the plant.

https://www.gardeningknowhow.com/houseplants/zebra-plant/zebra-houseplant-care.htm