Summarise What the Research Says About How Adults Learn Best

You want to study or train without wasting hours on methods that feel productive but do nothing. This names the two strategies cognitive science backs and why, flags two popular techniques with weak evidence, and tells you what the research says about how adults learn differently. A grounding to stop fooling yourself with busywork.

<context>
You want to understand the evidence on adult learning so you can study or train more effectively and stop wasting time on approaches that do not work.
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<task>
1. Name the two learning strategies most strongly supported by cognitive science and briefly explain why each works
2. Name two popular study techniques that feel effective but have weak evidence behind them
3. Explain what the research says about the role of sleep in consolidating new learning
4. Give one practical implication for someone building a self-study habit as an adult
</task>

<output_format>
- Four numbered sections, two to four sentences each
- Anchor claims to research or evidence without requiring specific citations
- Length: 200 to 300 words
- Tone: evidence-grounded and practical
</output_format>