Having low energy may also be down to diabetes. Around 850,000 people in the UK are estimated to be living with type 2 without realising it. A similar problem exists in the US.
The condition happens when your body becomes insensitive to the hormone insulin, which usually controls blood sugar levels.
One reason why diabetes makes you so tired is that having too high or too low blood sugar levels disrupts sleep, Dr Sufyan Hassain at King's College London told MailOnline.
未诊断的糖尿病患者
能量低的未诊断糖尿病也可能是糖尿病。据估计，英国约有85万人在没有意识到的情况下患有2型糖尿病。美国也存在类似的问题。
当你的身体对通常控制血糖水平的胰岛素激素变得不敏感时，就会发生这种情况。
伦敦国王学院的Sufyan Hassain博士告诉《每日邮报》说，糖尿病让人如此疲劳的一个原因是血糖水平过高或过低会扰乱睡眠。
'We know your quality of sleep varies with sugar levels, so having suboptimal sugar levels in can disrupt sleep making you tired,' he added.
Millions of people are also prediabetic, which can cause similar symptoms.
The link between type 2 diabetes and a lack of sleep is a vicious cycle. Not only can insomnia be a sign of the disease, experts think it may also be a cause.
It's thought that sleep deprivation increases insulin resistance, levels of stress hormone cortisol and inflammation in the body.
“我们知道你的睡眠质量随血糖水平而变化，因此血糖水平低于最佳水平会扰乱睡眠，使你感到疲劳，”他补充道
数百万人也有糖尿病前期，这可能导致类似症状。
2型糖尿病和睡眠不足之间的联系是一个恶性循环。失眠不仅是疾病的征兆，专家认为它也可能是一个原因
人们认为睡眠剥夺会增加胰岛素抵抗、应激激素皮质醇水平和体内炎症。
One of the most comprehensive papers yet, published in April by Bristol University, calculated that treating insomnia could trigger a drop in blood sugar levels comparable to losing 14kg (2st 3lbs).
If you are feeling very tired all the time and have to get up during the night to urinate a lot, then it may be a sign of the condition.
Other symptoms include feeling thirsty all the time, losing weight without trying to, blurred vision and cuts or wounds taking longer to heal.
布里斯托尔大学（Bristol University）4月份发表的一篇最全面的论文计算出，治疗失眠症可导致血糖水平下降，相当于减掉14公斤（2磅3磅）。
如果你一直感觉很累，不得不在晚上起床大量小便，那么这可能是这种情况的一个迹象。
其他症状包括一直感到口渴，不努力减肥，视力模糊，伤口或伤口需要更长时间才能愈合。
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