I'm gonna make a big guess here, as a newbie. An opportunity to test my newfound knowledge. :)

Is that the plant's normal position next to the window? Did you turn it or move after it started leaning? When you say "all of a sudden" what does that mean exactly? Overnight? A few days?

It looks less like a watering issue than a light issue, to me. My first instinct is that it is reaching for more sun. It almost looks as if the weight is pulling half of it down. How much light does it get daily?

Thanks for asking this question. Let's wait and see what the experts have to offer.

Hmm, there could be several things going on here. Aloe is one of the more outspoken succulents about its water needs: too little water and the leaves draw inwards around the stem and take on a bronze color; too much water the plant's lowest leaves turn pale yellow and feel gummy to the touch.

Looking at your picture, I don't see any signs of water problems. The first thing that comes to mind is etiolation, which occurs when a plant is receiving too little light or the light comes almost exclusively from a single direction. Since plants need the energy in sunlight to make food, they will stretch out to soak up as much light as possible. This is especially true of sun-loving arid plants like aloes. Do you routinely turn your plant a quarter to half turn to even out the growth?

The other thing is that Aloe plant, botonically named Aloe barbadensis, is a partially determinate grower. As such, the plant lands somewhere between a vine and an upright plant. As the plant gets taller it's pretty common for it to "fall over" to one side or lean. Eventually, new shoots will pop up near the base and the plant will begin to form a clump. I've had my aloe plant for almost 10 years, and mine did this very same thing. This growth habit is one of the main ways the plant spreads and produces more plants. Hope this helps!

As mentioned above, it does look like a light issue. However, I have a great deal of difficulty comparing my experience - growing the plant outdoors in full sun - to the experience of those who grow it indoors.

The leaves on my plants are more plump and more erect than those on yours. I don't have the appearance of a stem on my A. vera, either. They almost don't look like the same Aloe species.

My Aloe vera plant in in the ground -

I'm not saying your plant is unhealthy. It just has different growing conditions. That being said - any chance you can put the plant outside for some full sun therapy? If you wean it into the full sun so it won't get a sun burn, it may perk up faster.

BTW - I believe that both Aloe barbadensis and Aloe chinensis have been classified as Aloe vera now. Someone will correct me on that . . .

My plant always looked as the one in the picture crenda posted . Well balanced etc. When it starts leaning a bit I just turn the pot around a bit but it turned as in my picture overnight .. Never did that and been growing in the same spot for months..

Then get the plant out of the soil and check its roots, which if healthy should be yellowish. It may also be overpotted.

I am wondering about what you said about turning it:..."When it starts leaning a bit..." I wouldn't wait until plant starts leaning even a bit, I would just turn it 1/4 turn regularly. Maybe it doesn't matter?...

Vera-barbadensis, synonyms of the same plant. Young plants have spots

Larry, I assure you they do not have spots if they're the real Aloe vera.